Northern Pike Stocked · 12 plants · last 2023 Best: dawn, day, dusk Lake Koshkonong fishing
Lake Koshkonong fishing: not stocked since 2023. It was stocked with Muskellunge, Walleye, Northern Pike, and Yellow Perch on a natural lake. Also recorded: Largemouth Bass and Smallmouth Bass. Species guides list dawn and dusk for Muskellunge, Largemouth Bass, and Smallmouth Bass, dawn, dusk, and night for Walleye, and dawn, day, and dusk for Northern Pike and Yellow Perch.
- Last stocked
- 2023
- Walleye
- Plants on record
- 34
- Since 2010
- Species stocked
- 4 (+2 also recorded)
- Average size
- 4.7 in
- Surface acres
- 10,575.8
Fish at Lake Koshkonong
Northern Pike Stocked · 12 plants · last 2023 Best: dawn, day, dusk 
Walleye Stocked · 11 plants · last 2023 Best: dawn, dusk, night 
Muskellunge Stocked · 8 plants · last 2017 Best: dawn, dusk 
Yellow Perch Stocked · 3 plants · last 2023 Best: dawn, day, dusk 
Largemouth Bass Confirmed present Best: dawn, dusk Best: dawn, dusk
Largemouth Bass species guide
Smallmouth Bass Confirmed present Best: dawn, dusk Best: dawn, dusk
Smallmouth Bass species guideLake Koshkonong is well known for its great fishing seasons. For fishing to be able to occur on the lake, Walleye and Northern pike are stocked by the Wisconsin Department of Natural Resources. Anglers can find muskellunge, panfish, largemouth bass, smallmouth bass, northern pike, walleye, and catfish in Lake Koshkonong. (en.wikipedia.org, accessed September 22, 2026)(apps.dnr.wi.gov, accessed September 22, 2026)
Drafted by AI from the cited sources and checked before publishing.
How Lake Koshkonong is stocked
About 319 reported fish per acre, the most of 4 lakes in Jefferson County with both a fish count and a surface area.
Fish stocked in 2010
99,355
Fish stocked in 2011
108,018
Fish stocked in 2012
156,810
Fish stocked in 2013
320,743
Fish stocked in 2014
16,155
Fish stocked in 2015
400,800
Fish stocked in 2016
127,731
Fish stocked in 2017
484,633
Fish stocked in 2018
54,004
Fish stocked in 2019
589,355
Fish stocked in 2020
67,182
Fish stocked in 2021
434,231
Fish stocked in 2022
10,615
Fish stocked in 2023
505,851
Stocking history
| Date | Species | Quantity | Avg. length | Source |
|---|---|---|---|---|
| 2023 | Walleye | 434,037 | 1.32 in | report |
| 2023 | Northern Pike | 62,814 | 2.17 in | report |
| 2023 | Yellow Perch | 9,000 | 5 in | report |
| 2022 | Northern Pike | 6,573 | 3 in | report |
| 2022 | Northern Pike | 4,042 | 5.8 in | report |
| 2021 | Yellow Perch | 14,000 | 6 in | report |
| 2021 | Northern Pike | 37,056 | 3.63 in | report |
| 2021 | Northern Pike | 23,304 | 8.02 in | report |
| 2021 | Walleye | 359,871 | 1.64 in | report |
| 2020 | Northern Pike | 55,182 | 3.41 in | report |
| 2020 | Yellow Perch | 12,000 | 4 in | report |
| 2019 | Northern Pike | 33,431 | 2.16 in | report |
| 2019 | Northern Pike | 38,979 | 4.2 in | report |
| 2019 | Northern Pike | 4,020 | 9.4 in | report |
| 2019 | Walleye | 512,925 | 1.29 in | report |
| 2018 | Walleye | 13,380 | 2.5 in | report |
| 2018 | Northern Pike | 40,624 | 2.48 in | report |
| 2017 | Walleye | 483,343 | 1.55 in | report |
| 2017 | Northern Pike | 216 | 3.1 in | report |
| 2017 | Muskellunge | 1,074 | 10.8 in | report |
| 2016 | Northern Pike | 125,482 | 2.02 in | report |
| 2016 | Muskellunge | 2,249 | 10.9 in | report |
| 2015 | Muskellunge | 1,125 | 11.7 in | report |
| 2015 | Walleye | 399,675 | 1.3 in | report |
| 2014 | Muskellunge | 450 | 11.4 in | report |
| 2014 | Muskellunge | 1,000 | 3.1 in | report |
| 2014 | Walleye | 14,705 | 1.5 in | report |
| 2013 | Muskellunge | 5,998 | 9.7 in | report |
| 2013 | Walleye | 314,745 | 1.56 in | report |
| 2012 | Muskellunge | 2,500 | 9.6 in | report |
| 2012 | Walleye | 154,310 | 1.51 in | report |
| 2011 | Walleye | 108,018 | 1.36 in | report |
| 2010 | Walleye | 98,355 | 1.4 in | report |
| 2010 | Muskellunge | 1,000 | 12.9 in | report |
Access and facts
- Water type
- natural lake
- Nearest town
- Sumner, WI
- Facilities
- restrooms, dock
Lake Koshkonong has four public ramps across Jefferson and Rock counties; only the Royce-Dallman County Park ramp (Rock County) has restrooms and a dock, and none has an ADA-accessible boarding dock.
Drafted by AI from the cited sources and checked before publishing.
Advisories, closures, regulations and water conditions change. Check the Wisconsin Department of Natural Resources before you go.
About Lake Koshkonong
Lake Koshkonong is very shallow, averaging around six feet with a maximum depth of seven feet. Invasive species such as Curly-Leaf Pondweed and Zebra Mussel are present. (en.wikipedia.org, accessed September 22, 2026)(apps.dnr.wi.gov, accessed September 22, 2026)
Drafted by AI from the cited sources and checked before publishing.
Nearest lakes
Common questions
What fish are at Lake Koshkonong?
Fishing Lake Koshkonong usually means Northern Pike: Northern Pike accounts for 12 of 34 plants on record, ahead of Walleye and 2 more. Northern Pike was last stocked 2023, averaging 4.1 in. Walleye was last stocked 2023, averaging 1.5 in. Muskellunge was last stocked 2017, averaging 10 in. Yellow Perch was last stocked 2023, averaging 5 in. Largemouth Bass and Smallmouth Bass are recorded here outside the stocking reports.
When is Lake Koshkonong stocked?
Not stocked since 2023. About 319 reported fish per acre, the most of 4 lakes in Jefferson County with both a fish count and a surface area.
How big are the fish stocked at Lake Koshkonong?
Stocked fish average 4.7 in. Northern Pike average 4.1 in. Walleye average 1.5 in. Muskellunge average 10 in. Yellow Perch average 5 in.
How do you get on Lake Koshkonong?
The nearest town is Sumner, WI. Facilities include restrooms and dock. Lake Koshkonong has four public ramps across Jefferson and Rock counties; only the Royce-Dallman County Park ramp (Rock County) has restrooms and a dock, and none has an ADA-accessible boarding dock.
Which lakes near Lake Koshkonong were stocked more recently?
Whitewater Lake (15.5 mi) and Lake Kegonsa (16.1 mi) were stocked more recently. Whitewater Lake is also stocked with Walleye, Northern Pike, and Yellow Perch and Lake Kegonsa is also stocked with Northern Pike and Walleye.