2026 regulation year
Illinois Smallmouth bass 2026 — Season, Bag Limit, Size Rules
Micropterus dolomieu
Last updated
Illinois's stream smallmouth fishery is one of the most-overlooked resources in the Midwest. The Kankakee River + Fox River + Rock River + Vermilion River system supports premier stream smallmouth across the northern + western half of the state, and the Mississippi River pools (especially Pools 12 – 16 on the IL/IA boundary) hold trophy smallmouth on the IDNR/IA reciprocal management reach. Lake Michigan IL waters (Waukegan / Chicago Harbor / Calumet Harbor) carry a separate Lake Michigan smallmouth fishery driven by the harbor structure + breakwaters, where bass run a 21-inch minimum and a 1-fish daily limit. Statewide rule: NO statewide minimum length + a 6-fish daily aggregate across black bass; in rivers + streams no more than 3 smallmouth / day and all smallmouth must be released April 1 – June 15 (Mississippi / Ohio / Wabash / Illinois main stems excepted).
Get change alerts
Watch Illinois Smallmouth bass and we'll email you when a season, bag limit, slot, or closure changes. Free while in beta.
Season
Open year-round Open year-round on all public waters; in most rivers + streams all smallmouth must be released April 1 – June 15.
Bag & possession
- Daily bag
- 6 / day combined black bass statewide, no more than 3 smallmouth / day in rivers + streams; all smallmouth released Apr 1 – Jun 15 in most rivers; Kankakee 12–18 in protected slot, 3 / day
- Possession
- One day's harvest on the water (6) — Illinois sets no separate possession multiple beyond the daily harvest limit
Size, slot, trophy rules
- Size
- No statewide minimum length; Mississippi River 12–14 in by pool (14 in IL/IA, 12 in IL/MO); 12 in min Ohio + Wabash boundary water; 21 in min Lake Michigan; site-specific minimums + protected slots on listed lakes
Gear restrictions
- Hook-and-line; snagging prohibited for black bass
- Rivers + streams: no more than 3 smallmouth / day; all smallmouth released April 1 – June 15 (Mississippi / Ohio / Wabash / Illinois main stems excepted)
- Mississippi River main stem: IL or boundary-state licence honored
- Lake Michigan: 21 in min, 1 / day for large + smallmouth bass
Named water-body overrides
Where statewide rules differ on specific Illinois waters:
Kankakee River (IL/IN)
12–18 in protected slot, 3 / day; premier northeast IL stream smallmouth
Fox River (Wisconsin border to Illinois River)
6 / day, no more than 3 smallmouth / day, released Apr 1 – Jun 15 (river rule); Fox Chain O' Lakes feeder
Rock River
6 / day, no more than 3 smallmouth / day, released Apr 1 – Jun 15 (river rule); western IL stream smallmouth + walleye + sauger
Mississippi River
14 in min, 5 / day on IL/IA pools; 12 in min, 6 / day on IL/MO pools
Lake Michigan
21 in min, 1 / day for large + smallmouth bass
Official source
Illinois Department of Natural Resources publishes the authoritative 2026 Illinoisfishing regulations. Always verify the current rule before fishing — emergency closures and in-season changes can override what's published here.
The smallmouth bass rules on this page are sourced from Illinois Department of Natural Resources's official smallmouth bass regulation page.
Visit official Illinois fishing regulations →
Emergency-order channel
Smallmouth bass closures, slot-limit changes, and harvest pauses are posted to Illinois Department of Natural Resources's emergency-order feed — check it before any Illinois trip during the active season.
Frequently asked questions
- When is smallmouth bass season in Illinois?
- Illinois keeps smallmouth bass open to fishing year-round for the 2026 regulation year — there is no closed season, though the daily bag and size limits below still apply every day.
- What is the Illinois bag limit for smallmouth bass?
- The Illinois daily bag limit for smallmouth bass is 6 / day combined black bass statewide, no more than 3 smallmouth / day in rivers + streams; all smallmouth released Apr 1 – Jun 15 in most rivers; Kankakee 12–18 in protected slot, 3 / day. The possession limit is One day's harvest on the water (6) — Illinois sets no separate possession multiple beyond the daily harvest limit. Some named waters set a different limit — check the water-body overrides above.
- What size smallmouth bass can you keep in Illinois?
- The Illinois size rule for smallmouth bass is No statewide minimum length; Mississippi River 12–14 in by pool (14 in IL/IA, 12 in IL/MO); 12 in min Ohio + Wabash boundary water; 21 in min Lake Michigan; site-specific minimums + protected slots on listed lakes.
- Do you need a license to fish for smallmouth bass in Illinois?
- Yes. Illinois requires a valid fishing license to fish for smallmouth bass, with the usual exemptions for young children, state free-fishing days, and some senior or disabled-veteran categories. A license is valid only in the state that issued it, so non-residents need a Illinois license — compare resident and non-resident Illinois fees on the state regulations page below.
- Are there gear restrictions for smallmouth bass in Illinois?
- Yes. In Illinois, smallmouth bass fishing carries these gear rules: Hook-and-line; snagging prohibited for black bass; Rivers + streams: no more than 3 smallmouth / day; all smallmouth released April 1 – June 15 (Mississippi / Ohio / Wabash / Illinois main stems excepted); Mississippi River main stem: IL or boundary-state licence honored; Lake Michigan: 21 in min, 1 / day for large + smallmouth bass.
- Do specific Illinois waters have different smallmouth bass rules?
- Yes. 5 named Illinois waters carry rules that override the statewide smallmouth bass regulation, including Kankakee River (IL/IN), Fox River (Wisconsin border to Illinois River), Rock River, and 2 more. See the named water-body overrides above for the exact rule on each.