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Fishing Köyliönjärvi: what the data says
3,078-acre lake in Finland. The lake tops out around 33 ft. The depth chart is built from real state fisheries GPS surveys, so the humps, channels and drop-offs you see are measured, not guessed. What follows comes from the same scoring engine that paints the spots above.
Traced from the shoreline, Köyliönjärvi runs 3,073 acres with 22.7 miles of edge. That shoreline is heavily fingered (development index 2.9) — bays, points and pockets everywhere, which multiplies the fishable edge. About 90% of the surface sits shallower than 15 ft — that's the weed-and-bait zone.
Ilmainen interaktiivinen kalastuskartta — Köyliönjärvi, Suomi: syvyyskäyrät todellisista syvyysmittauksista 10 metriin (33 jalkaa) asti, parhaat kalapaikat lajeille ahven, hauki, kuha ja muut. Syvyyskartta on mallinnettu järven todellisesta rantaviivasta ja suurimmasta syvyydestä — käytä sitä suuntaa-antavana, älä koskaan navigointiin.
European Perch fishing at Köyliönjärvi
Spring puts european perch in skinny water — 3 to 12 ft is the zone. Warm water sends them out to 8 to 28 ft; cold water stacks them in 12 to 33 ft. Shallow bay flat is the standout, a weed flat at roughly 3 ft, rated prime for spring european perch. Plan around early morning in the warm months. A drop-shot micro plastics or a small crankbait (perch pattern) covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | Shallow bay flat (3 ft) | Small jig + curly tail, Inline spinner #1-2 |
| Summer | 8 to 28 ft | dawn | Deep basin (28 ft) | Drop-shot micro plastics, Small crankbait (perch pattern) |
| Fall | 10 to 33 ft | midday | Deep basin (28 ft) | Jigging spoon (small), Drop-shot on deep flats |
| Winter | 12 to 33 ft | midday & dawn | Deep basin (28 ft) | Tungsten jig + maggots, Small balance jig |
Northern Pike fishing at Köyliönjärvi
Spring puts northern pike in skinny water — 2 to 8 ft is the zone. As the season builds they drop to 8 to 20 ft, wintering in 5 to 15 ft. Spring northern pike concentrate at Shallow bay flat, a prime-rated weed flat around 3 ft. Warm-month bites cluster around early morning and the evening. A bucktail or a weedless spoon over cabbage covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | Shallow bay flat (3 ft) | #5 inline spinner, Spoon (red/white) |
| Summer | 8 to 20 ft | dawn & dusk | Break off the point (20 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 6 to 18 ft | midday & dawn | Sharp break (15 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 5 to 15 ft | midday | Weed flat (5 ft) | Tip-ups, Large jigging spoon |
Zander fishing at Köyliönjärvi
Spring puts zander in skinny water — 4 to 15 ft is the zone. Warm water sends them out to 10 to 33 ft; cold water stacks them in 10 to 33 ft. Break off the point is the standout, a drop-off at roughly 20 ft, rated prime for fall zander. Plan around the evening and early morning in the warm months. A vertical softbait over humps or a deep crankbait covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 4 to 15 ft | dusk & dawn | Main-lake point (8 ft) | Softbait on jighead (10-12 cm), Shallow crankbait at dusk |
| Summer | 10 to 33 ft | dusk & dawn | Break off the point (20 ft) | Vertical softbait over humps, Deep crankbait |
| Fall | 10 to 33 ft | dusk & night | Break off the point (20 ft) | Big softbait (12-16 cm) slow-rolled, Jigging spoon |
| Winter | 10 to 33 ft | dusk & dawn | Deep basin (28 ft) | Vertical jig / mormyshka with bait, Slow blade bait |
Lake Whitefish fishing at Köyliönjärvi
When the water first warms, lake whitefish slide up into 10 to 33 ft. There's no big seasonal slide here — summer means 10 to 33 ft, winter 10 to 33 ft. If you only fish one area, make it Deep basin: a deep basin around 28 ft that scores prime in summer. In summer the feeding windows fall in early morning. Keep a blade bait vertical or a small jigging spoon rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 10 to 33 ft | midday & dawn | Break off the point (20 ft) | Small jig + waxworm, Blade bait (small) |
| Summer | 10 to 33 ft | dawn | Deep basin (28 ft) | Blade bait vertical, Small jigging spoon |
| Fall | 8 to 30 ft | dusk | Break off the point (20 ft) | Small spoon (gold), Jig + plastic larva |
| Winter | 10 to 33 ft | midday & dawn | Deep basin (28 ft) | Jigging spoon + bead chain, Tungsten jig + waxie |
Burbot fishing at Köyliönjärvi
Start shallow in spring: burbot sit in 10 to 33 ft that time of year. Summer fish stay in 10 to 33 ft, and winter fish hold in 8 to 33 ft. The spot to know is Deep basin, a deep basin in about 28 ft of water that rates prime for burbot in spring. Warm-month bites cluster around after dark and midday. Throw a heavy jig + cut bait until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 10 to 33 ft | night & dusk | Deep basin (28 ft) | Glow jigging spoon + cut bait, Rattle bait (dark) |
| Summer | 10 to 33 ft | night & midday | Deep basin (28 ft) | Heavy jig + cut bait |
| Fall | 10 to 33 ft | night & dusk | Deep basin (28 ft) | Glow spoon + minnow head, Blade bait (slow) |
| Winter | 8 to 33 ft | night & dusk | Deep basin (28 ft) | Glow tungsten + cut bait, Rattle spoon + minnow head |
Notable structure
- Deep basin: deep basin, around 28 ft
- Break off the point: drop-off, around 20 ft
- Shallow feeding flat: feeding flat, around 20 ft
- Shallow feeding flat: feeding flat, around 17 ft
- Sharp break: drop-off, around 15 ft
- Feeding flat: feeding flat, around 10 ft
- Main-lake point: point, around 8 ft
- Secondary point: point, around 6 ft
- Weed flat: weed flat, around 5 ft
- Weed flat: weed flat, around 5 ft
- Shoreline point: point, around 4 ft
- Shallow bay flat: weed flat, around 3 ft
- Back-bay flat: weed flat, around 2 ft
Köyliönjärvi fishing regulations
Season dates, license requirements, and size and bag limits for Finland waters are set by the Kalastusrajoitus.fi (official Finnish restriction service) — and special regulations can apply to Köyliönjärvi specifically, so confirm the current rules before you fish.
Check the official Finland fishing regulations →
Common questions
How deep is Köyliönjärvi?
Köyliönjärvi is about 33 ft (10 m) deep at its deepest point. The depth chart here comes from real state fisheries GPS surveys, so the contours reflect measured depths.
What fish are in Köyliönjärvi?
Anglers target zander, northern pike, european perch, lake whitefish, burbot on Köyliönjärvi. This isn't a survey of the water — none is published for it — but an informed estimate from the species common to the region, narrowed by this water's depth, size and each species' range.
Where is the best fishing spot on Köyliönjärvi?
Shallow bay flat is the top-rated area: a weed flat in about 3 ft of water that rates prime for european perch in spring. Scroll up to the map for the complete spot list by species and season.
When is the best time to fish Köyliönjärvi?
For european perch, the summer bite is best in early morning. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
What are the fishing regulations for Köyliönjärvi?
Fishing on Köyliönjärvi is regulated by the Kalastusrajoitus.fi (official Finnish restriction service). Check the official Finland regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Nearby waters
Pyhäjärvi (Säkylä) 8 mi · Puurijärvi (ump.kasv.) 13 mi · Koskeljärvi 14 mi · Turajärvi 16 mi · Narvijärvi 17 mi · Elijärvi 17 mi · Sääksjärvi 20 mi · Ylistenjärvi 21 mi · Kiikoisjärvi 24 mi · Pinkjärvi 24 mi · Houhajärvi 25 mi · Kaljasjärvi 25 mi
See how Köyliönjärvi stacks up: best zander lakes in Finland · best northern pike lakes in Finland · best european perch lakes in Finland · best lake whitefish lakes in Finland
Browse all Finland fishing maps or see every water on DepthScout. Bathymetry credit: state fisheries survey programs. How we build these maps. For fishing guidance only, never navigation.