Fishing Þingvallavatn: trophy brown trout, four chars, and the plan to catch them on foot

What and where it is

Þingvallavatn sits in Þingvellir National Park in south-west Iceland, about 45 minutes by road from Reykjavík and a stop on the Golden Circle. It is the largest natural lake in the country, roughly 84 km² (about 32 sq miles), spring-fed, extraordinarily clear and cold, set in the rift valley where the North American and Eurasian plates pull apart.

The lake fills the floor of the Þingvellir rift, so its margins are black lava rock cut by deep, clear fissures, and the water is fed by cold springs filtered through the lava. That gives it two defining features. The first is clarity: you can see fish move and you can see your fly, which is wonderful and unforgiving in equal measure. The second is the famous trophy brown trout, a large, predatory "ferox"-type fish that grows heavy on a diet of the lake's char and stickleback. Fish into double figures by weight are caught here, and the lake has a real reputation for browns far larger than that.

It is an easy water to reach for a country this remote. Most visiting anglers come out from Reykjavík for the day, often folding it into a Golden Circle drive. The angling sector that this guide covers is inside the national park on the northern and western shores, where the permit and the rules are the park's own. Þingvellir is a UNESCO World Heritage site for its history as the site of Iceland's old open-air parliament, so you are fishing somewhere people visit for more than the trout: tread lightly.

This is a salmonid lake and nothing else to speak of. Three of Iceland's handful of freshwater fish live here: brown trout, Arctic char and the three-spine stickleback (the char's and the trout's food). There is no pike, no perch, no zander. That keeps the trip simple: two fish, both wild, both worth the journey.

The fish, and where, when and how to catch each

Two fish, both wild and both on the fly. The brown trout is the trophy draw, a big predator best in the cold shoulders of the season. The Arctic char comes in four distinct shapes in this one lake and fishes through the summer. Each holds at a different depth, moves through the year, and wants a different fly. The cards below give you where, when and how for each.

A note on the lake's character. That is the whole fishery: two salmonids, both wild, no coarse fish to muddy it. There is also the three-spine stickleback, but you do not fish for it; it is what the trout and char eat, and why the browns grow so big. Match a streamer or a small fly to that food and you are fishing the right thing.

I have set each fish out as a card. Read the one for the fish you want, then check the seasonal section for how its depth and mood move through the year, and follow the rig link to build the method.

How the fishing changes by season

The season runs 20 April to 15 September. Late April and May are fly-only, browns released, and the classic big trophy-brown window in cold water. June to mid-September opens fly, worm and lure, and is the char's summer. Late August into September brings the big browns back onto the margins. It is shut the rest of the year.

Here is the season in plain terms, tied to the two fish.

• Closed (mid-September to 20 April). No angling in the park sector. The lake rests under ice and cold through the Icelandic winter. Plan your trip inside the open dates, not around them.
• The opening, fly only (20 April to 31 May). The classic trophy-brown window. Cold, clear water brings the big browns onto the lava margins within reach of a wade. The park sector is fly only in this window and every brown trout must be released, so it is sight-fishing for a giant with a streamer or a deep nymph. Char are about but the browns are the prize.
• Early and mid summer (June and July). The general season opens: fly, worm and lure are all allowed from 1 June. The trophy browns ease off as the water warms, and the char come into their own on small dries and nymphs (and small spinners). A busy, free-rising summer day, with a chance of a brown still.
• High summer (late July into August). Char fishing stays good; the big browns are at their quietest in the warm, bright, long-daylight weeks. Fish the low-light edges of the day and the deeper drop-offs for any brown.
• The back end (late August to 15 September). The browns come back onto the margins as the water cools, so the second trophy window opens, with char still around. Often the best all-round fortnight of the year before the season shuts on 15 September.

What you can eat (and what you must release)

Brown trout and Arctic char are both excellent eating, and you may keep fish within the permit's terms during the general season (from 1 June). But in the fly-only opening (20 April to 31 May) every brown trout goes back, tagged research fish must always be released, and there is a strong catch-and-release ethic for the big browns. Every fish, kept or released, must be logged.

A few rules shape what you keep here, and they matter, so be exact.

• The fly-only opening is brown-trout release. From 20 April to 31 May the park sector is fly only and all brown trout must be released (source: Þingvellir National Park, as of 5 June 2026). Char are not the focus that early. From 1 June you may keep fish within the permit's terms.
• Release the big browns by choice. The trophy browns are the reason this lake has its name. There is a strong, widely-kept catch-and-release ethic for the large fish all season: take a photo, slip it back. If you want a fish for the table, a char or a modest brown in the general season is the one to keep.
• Tagged fish always go back. Some browns carry research tags. If you catch a tagged fish, release it and report the tag (the park asks tagged-fish reports go to the research contact, johannes@laxfiskar.is). This is an active research lake.
• Mercury advice on the biggest browns. Brown trout over about 60 cm can carry high mercury levels; the park advises they are not recommended for pregnant or nursing women (source: Þingvellir National Park, as of 5 June 2026). Another reason the giants are better released than eaten.
• Both fish are fine eating within the rules. A char or a keepable brown from the general season is superb on the plate. Keep within the permit's terms, handle fish in wet hands, unhook in the water where you can, and clean and dry all your kit between waters (Iceland is strict about not carrying pathogens between catchments; see the rules below).

The permit and the rules

Yes, you need a permit. In the park sector it is a national-park day permit for one rod, ISK 2,500 (2026), bought at the Leirar service centre or on the park website. Children fish free with a paying adult. The lake is shore-only, no boats, the season is 20 April to 15 September (fly-only until 31 May), and every catch must be logged in the national research catch log.

What the permit is, and the two ways to hold one. The angling sector inside Þingvellir National Park is covered either by its own park day permit (ISK 2,500, one rod) or by the national Veiðikortið fishing card: the park states that holders of Veiðikortið also have access to the area, and asks them to display the card clearly in the car windscreen (source: Þingvellir National Park). The Veiðikortið is ISK 9,900 for 2026 and covers 38 waters including Þingvallavatn (source: veidikortid.is, as of 5 June 2026). So you can buy the park day permit on arrival, or arrive with a valid Veiðikortið; do not turn up with no permit at all.

2026 park permit (Þingvellir National Park, as of 5 June 2026):

How to get it

• Buy at the Leirar service centre in the national park (it is also where you park and orient), or online on the park website.
• It is a one-rod permit; carry it while you fish.
• If you book a guided day from Reykjavík (see below), the permit is usually included in the package, so check before you also buy one.

The rules that shape the trip

Why there is no size or bag table here. Unlike a French or German water, the park sector runs on these rules rather than a published per-fish size-and-quota grid: the fly-only-release opening, the release ethic for big browns, the mercury note on the giants, and the catch log do the work. Keep within the permit's terms and the season, log everything, and confirm any current keep limits with the park when you buy (as of 5 June 2026).

Where to fish from the shore

You fish on foot, wading and casting from the lava margins and the drop-offs along the park's northern and western shore. The named access zones run from Vatnskot and Lambhagi in the park down to Arnarfell in the south, taking in Tóftir, Vörðuvík, Öfugsnáði, Nes, Vatnsvík, Hallvík and Fornasel. The clear margins and fissure edges are where the fish patrol.

The lake drops away into deep, clear fissures close to the shore, so from a wade you are fishing the margin, the lip of the drop-off and the bays where food gathers. These are the named park angling zones (Þingvellir National Park, as of 5 June 2026), running broadly north to south along the accessible shore:

• Vatnskot and Lambhagi. Classic shore marks near the park heart, with lava margins and bays; a sensible first stop and where the access is easiest.
• Tóftir, Vörðuvík and Öfugsnáði. Rocky margins and small bays along the shore, the kind of clear edge the browns patrol.
• Nes and Vatnsvík. Productive shore zones with drop-offs within a cast; Vatnsvík (the Vatnsviti area) is a well-known stretch.
• Hallvík and Fornasel. Further along the shore, quieter water and good lava structure.
• Arnarfell (south end of the sector). The southern reach of the park angling zone, with deeper drop-offs off the points.

What depth and structure mean for method from the shore

• Shallow lava margins and bays (a rod-length or two out): rising char on small dries, and cruising browns at first and last light. A dry-fly rig for the risers; a streamer rig cast and stripped along the edge for a hunting brown.
• The drop-off, where the margin falls into a fissure: the productive seam. Browns and the larger char hold along it. A nymph rig fished slow and deep along the lip, or a streamer worked across it.
• Off the points and into the clear deeps: the big predatory browns range here. A weighted streamer or a deep nymph on a longer leader, with care over the clear water.

A note on the wade itself: the lava is sharp and the fissures are deep and steep-sided, so wade carefully, do not step into a crack you cannot see the bottom of, and keep your back to the low sun where you can, because the clarity means the fish see you as easily as you see them.

On foot, not by boat (and the time of day)

There is no boat option here: the park sector is shore-only and boats and float tubes are banned, so the whole trip is wade-and-cast. Fish the first and last hours of light, when the big browns come onto the margins and the clarity works for you. The bright middle of a long Icelandic summer day is the slow patch, especially for the trophy fish.

Plain version: you have one place to fish from, the shore, so the trip is about timing and reading the clear water rather than choosing bank or boat. Fish the trophy browns at dawn and dusk in the cold shoulders of the season on a streamer or deep nymph; fill a summer day with char on small flies; and switch to small spinners from June if the fly is not the day's tool. The clarity is the constant: keep low, keep back, and fish the low-light edges.

This table is the core decision the trip turns on. It lives on the cheat sheet too. Read it as: pick your fish, pick when, and it gives you the fly (there is no bank-versus-boat column here, because it is all on foot).

Guided day trips from Reykjavík

Because it is shore-only and an hour from the capital, the simplest way to fish Þingvallavatn well is a guided day from Reykjavík. The guide supplies the tackle, includes the park permit and transport, knows the zones, and reads the clear water for you. There is no boat to hire, so a guide or a self-guided wade with your own permit are the two ways onto the fish.

Two ways to fish it, both on foot.

Guided day (recommended for a first visit)

Operators run wade-and-fly day trips out of Reykjavík, often as part of a Golden Circle fishing day, with the permit, transport, gear and guiding included. Book directly:

• Fly Fishing Iceland – flyfishingiceland.is, info@flyfishingiceland.is, +354 897 3443. Runs a Golden Circle / Þingvallavatn day with permit, transport, gear and guiding included; hotel pickup around 8am, back by 6pm. Day-trip prices were in the region of €620 to €970 per angler depending on group size for 2026 (confirm the current rate when you book; as of 5 June 2026).
• Other guided Þingvallavatn fly trips and multi-day packages are listed on gofishing.is and the international fly-travel operators; the trophy-brown packages run to several thousand pounds for multiple days, so a single guided day is the value option for most visitors.

Self-guided on foot

Buy the ISK 2,500 day permit at the Leirar service centre or online, drive out from Reykjavík (about 45 minutes), park, and wade one of the named zones above. You need no boat and no special craft; just the permit, your fly or light spin kit, careful wading, and the catch log open on your phone.

Where to stay

Most anglers fish Þingvallavatn as a day out from Reykjavík, which has the full range of places to stay an hour away. To wake up by the lake, there is accommodation in and around the Þingvellir and Laugarvatn area on the Golden Circle. Buy your permit at the Leirar service centre when you arrive.

Base in Reykjavík (the usual choice). The capital is about 45 minutes by road, has every kind of accommodation, and is where the guided days pick you up. For a single guided or self-guided day this is the simplest base.

Stay near the lake (to fish the light)

To be on the water at first and last light without the drive, look at:

• Þingvellir / Golden Circle guesthouses and hotels around the national park and the nearby villages.
• Laugarvatn, a short drive east on the Golden Circle, has hotels and guesthouses (and the well-known geothermal baths for after fishing) and makes a handy lake-side base.
• Selfoss and the southern Golden Circle towns are within easy reach for a wider choice.

The permit point on arrival. Whatever your base, buy the day permit at the Leirar service centre in the park (or online beforehand) before you fish, and check whether your guided package already includes it.

The methods, and the rigs to build them

Fly fishing is the method here. Three fly setups cover both fish: a streamer for the big predatory browns, a nymph for fish feeding below the surface, and a dry fly for rising char. From 1 June, small spinners on a light spin outfit also take char and smaller browns. Each links to its own build page; the build steps and knots live there.

Map of fish, where and when, to a method. The build instructions and the knots live on the rig and knot pages, so I link rather than repeat them.

• Big brown trout, hunting the margins → streamer rig. A streamer that imitates a fleeing char or stickleback, cast along the edge or off the points and stripped back. The method for the trophy fish, early and late in the season.
• Browns and larger char along the drop-off → nymph rig. A weighted nymph fished slow and deep along the fissure lip, where the fish hold and feed below the surface most of the time.
• Rising char in the bays → dry-fly rig. A small dry fly to char working the surface on a summer day. The free-rising, busy side of this fishery.
• Char and smaller browns on a lure, from 1 June → small spinners on the light spin kit. When the fly is not the day's tool and lures are allowed, a small spinner on the same light spinning outfit the drop shot page describes will take char and smaller browns. Fly only in the 20 April to 31 May opening, so confirm your dates first.

The knots that tie the fly rigs are the perfection loop (the leader loop, to join leader to fly line loop-to-loop), the surgeon's knot and the blood knot (the leader-to-tippet joins), and the improved clinch knot (tippet to fly). For the light spin option, the Palomar ties the spinner on. Each rig page links the knots it needs.

Build your kit (the kit builder and the shopping list)

Pick your fish (brown trout or char) and your method (fly or light spin), and the kit builder trims the shopping list and the rigs to exactly what you need. One fly outfit, a wallet of leaders and tippet, and a box of streamers, nymphs and small dries cover the lake; a light spin outfit with a few small spinners is the alternative from June. No brands, no prices.

That is the whole list. One fly outfit, a floating line and a sink-tip, a wallet of leaders and tippet, and a box split into streamers, nymphs and small dries. Add a light spin rod and a few small spinners only if you want the lure option from June. Buy generic sizes and types; you do not need a named brand to catch a Þingvallavatn brown.

A trip checklist

Before you go: check your dates against the 20 April to 15 September season and the fly-only opening, buy the ISK 2,500 park permit (or confirm your guide includes it), decide guided or self-guided on foot, pack the fly kit (and a light spin outfit for June), know the catch-log and release rules, and clean your gear. Then print the cheat sheet and take it.

Do this in order:

1. Check your dates against the season. The season is 20 April to 15 September. Remember 20 April to 31 May is fly only and browns are released; lures are allowed from 1 June. The trophy-brown windows are late April–May and late August–September; summer is char.
2. Hold a permit. Buy the ISK 2,500 day permit at the Leirar service centre or online, or arrive with a valid national Veiðikortið card (ISK 9,900, 2026), which the park also accepts (display it in the windscreen). If you book a guide, check whether the permit is already included.
3. Decide guided or on foot, and book it. First visit, or want the marks read for you: book a guided day from Reykjavík (Fly Fishing Iceland and others). Self-guided: just the permit and a careful wade. There is no boat to hire or launch.
4. Pack the fly kit. A 6 – 8 weight outfit, a floating line and a sink-tip, leaders, tippet, and a box of streamers, nymphs and small dries, plus waders, a wading staff, polarised glasses and a net. Add a light spin rod and small spinners only for June onward. The shopping list above (trimmed by the kit builder) is your packing list.
5. Know the rules. Log every catch in the research catch log; release all browns in the fly-only opening; release tagged fish and report them; release big browns by choice (and note the mercury advice on fish over 60 cm). Wet hands, careful release.
6. Clean and dry your gear before and after, so you carry nothing between waters.
7. Print the cheat sheet and fold it into the box. Get the printable cheat sheet

Common mistakes

The big ones: turning up outside the 20 April to 15 September season, expecting to fish from a boat or float tube (banned), arriving in the fly-only opening rigged for lures, fishing only the bright middle of a long summer day, forgetting the mandatory catch log, and turning up with no permit at all. None is hard to avoid once you know.

• Expecting a boat. This lake is shore-only: no boats, no float tubes, no belly boats in the park sector. The whole trip is wade-and-cast. Plan your kit and your spots around the shore.
• Turning up with no permit. You need either the park's own day permit (ISK 2,500) or a valid national Veiðikortið card; the park accepts both. What you cannot do is fish on nothing. Buy the day permit at Leirar, or carry your Veiðikortið and show it in the windscreen.
• Arriving fly-less in the opening. From 20 April to 31 May it is fly only and browns are released. Turn up in May rigged only to spin and you cannot fish properly. Lures are allowed from 1 June.
• Fishing the bright middle of the day. This is gin-clear water under long Icelandic daylight. The trophy browns come best at first and last light. Fish the low-light edges and rest in the bright hours.
• Forgetting the catch log. Every catch, kept or released, must be logged in the research catch log. Keep it open on your phone and log as you go; it is a condition of fishing here, and the data matters.
• Spooking fish in the clarity. You can see the fish, which means they can see you. Keep low, keep back from the edge, and watch your shadow and the sun.
• Not cleaning your kit. Iceland is strict about moving pathogens between catchments. Clean and dry your waders, net and flies before and after.

Frequently asked questions

The questions travelling anglers ask most about Þingvallavatn: what is here, the permit and the Veiðikortið card, fishing from a boat, the season, whether it is fly only, how big the browns get, what you can eat, the catch log, fishing it from Reykjavík, and the kit.