Grass

Grass Lake is subject to periodic winterkill. The last winterkill occurred in the winter of 1980-81. State park personnel have been plowing an area of the lake during the winter in an attempt to prevent or limit the severity of winterkill. There is an extremely abundant bullhead population. Black bullheads were the most abundant at 170 per gill net, followed by yellow bullheads and brown bullheads. Only one gill net was set due to the anticipated high number of bullheads. Northern pike abundance appears to be increasing as nineteen were captured with an average weight of 1.6 lbs. Two age-classes of northern pike composed the sample. Bluegill abundance was 127.2 per trap net lift, which is five times the area median. Only 8% of the bluegills measured were greater than 7.0 inches in length. Bluegill growth rates appear to be good despite their high abundance. Three black crappies were sampled, all age-I+. Five walleyes were captured and appeared to be the result of the 1986 fry and fingerling stocking. Walleyes ranged in length from 15.2 to 19.4 inches.

The trap net catch rate of Bluegills was three times the area median. The catch rate of walleyes was also very high. Walleyes are the result of a 1980 Walleye fry stocking. Grass Lake is susceptible to periodic winterkill.

Based on Minnesota DNR survey data, anglers target Hybrid Sunfish, Bluegill, Northern Pike, Walleye, and Pumpkinseed in Grass. See the full species list above for catch rates, size structure, and quality scores.

We don't have a confirmed public access point on record for Grass. Check the DNR LakeFinder page for current access details before you go.

Grass has a maximum depth of 21 feet, per Minnesota DNR data.

The most recent Minnesota DNR survey data for the main sport fish in Grass is from 1989. Surveys this old should be treated with some caution — fish populations change over time.

No invasive species are on record for Grass in Minnesota DNR data. Always clean, drain, and dry your equipment to help keep it that way.

No — Grass has no lake-specific regulations in the 2026 Minnesota DNR regulations, so statewide Minnesota limits apply. The statewide sunfish limit is: 20 combined total. Verify current rules with the Minnesota DNR before keeping fish.