🌤 Weather at Coffeen Lake State Fish and Wildlife Area by season
| Spring | Summer | Fall | Winter |
|---|---|---|---|
| 34–78 °F | 63–89 °F | 35–82 °F | 21–44 °F |
Each range runs from the coldest monthly average low to the warmest monthly average high in that season (1991-2020 climate normals), measured at Hillsboro, 7 mi away, elevation 630 ft. Conditions at the park can differ from the station, especially where elevation differs — check a forecast before you go.
🏆 Central Illinois Fishing — 1,175-acre cooling lake offering year-round warm-water fishing — heated discharge keeps fish active in winter
Coffeen Lake State Fish and Wildlife Area centers on a 1,175-acre power plant cooling lake in Montgomery County. The warm-water discharge from the power plant creates unique fishing conditions — largemouth bass, channel catfish, and crappie remain active even in winter when natural lakes freeze. Cooling lakes are among the most productive fisheries in Illinois, offering catch rates far above natural waters.
Visitor Information
| Detail | Information |
|---|---|
| Location | Montgomery County, IL |
| Entry Fee | Free |
| Lake | 1,175 acres! |
| Fishing | Warm-water — fish bite year-round! |
About Coffeen Lake
Coffeen Lake State Fish and Wildlife Area in Montgomery County surrounds a 1,100-acre power plant cooling lake — one of the best warm-water fishing destinations in central Illinois. The lake’s warm discharge creates extended fishing seasons and supports trophy largemouth bass, channel catfish, and crappie populations.
Coffeen Lake State Fish and Wildlife Area in Montgomery County provides fishing and hunting on a 1,100-acre power plant cooling lake. The warm water discharge from the power plant creates unusual conditions — species like largemouth bass and channel catfish grow to large sizes in the heated water. These industrial-origin lakes are among Illinois’s most productive fisheries.
Things to Do
Fishing for largemouth bass, channel catfish, crappie, and bluegill (the warm water extends the fishing season), boating, waterfowl hunting (seasonal), and birdwatching. The lake’s warm waters attract unusual waterfowl in winter.
Fishing for largemouth bass, catfish, and crappie (the warm water produces fast-growing fish), boating, hunting (seasonal), and wildlife observation. A unique power-plant-lake fishery.
Insider Tips
Bass fishing: Coffeen Lake is a 1,100-acre cooling lake fed by a power plant — the warm water discharge creates excellent year-round fishing, especially for largemouth bass and channel catfish. Pro tip: The warm water outflow area is productive even in winter when other lakes are frozen. Local knowledge: Bank fishing access is excellent along the dam and designated shoreline areas.
Best Time to Visit
Spring: Bass spawning — excellent fishing. Year-round: Warm water discharge keeps fishing productive. Fall: Less crowded, consistent catches. Summer: Peak boating season.
Frequently Asked Questions
Why is Coffeen Lake warmer than other Illinois lakes?
Coffeen Lake receives warm water discharge from the adjacent power plant, keeping water temperatures elevated year-round. This creates a unique fishery where bass and catfish remain active even during winter months when other Illinois lakes are near freezing.
Keep exploring: The closest neighbors are Ramsey Lake State Recreation Area (within about an hour’s drive) and Kaskaskia River State Fish & Wildlife Area (within about an hour’s drive).
🐾 Dogs & Pets at Coffeen Lake State Fish and Wildlife Area
- Pets allowed? statewide rule
- Pets are allowed in Illinois state parks and on trails as long as they are leashed at all times.
- Leash rule statewide rule
- Leash required at all times; state code caps leash length at 10 feet
- Beaches & swim areas statewide rule
- Pets are prohibited in areas posted 'NO PETS', reserved for beach areas, concession areas and crowded campground/picnic areas (e.g. no dogs on the beach at Illinois Beach State Park)
- Cabins & lodging statewide rule
- Pets are not allowed in campground cabins
- Statewide exceptions statewide rule
- Leash rule exceptions for hunting dogs, field trials and dog training areas; pets must not be left unattended
Are dogs allowed at Coffeen Lake State Fish and Wildlife Area?
Pets are allowed in Illinois state parks and on trails as long as they are leashed at all times. Individual parks can post stricter rules — check signage on arrival.
Rules verified July 2026 via dnr.illinois.gov. More: Illinois state parks guide · Dog rules in all 50 states compared
Park Location
Plan your gear for Coffeen Lake State Fish and Wildlife Area
From our editorial guides, matched to this park’s activities:
