FrostList

Boat Winterization in Illinois

In Illinois, local boat deadlines run from Oct 17 to Nov 8, with a median around Oct 25 — a spread of weeks that a single statewide date would miss. Find your city below; each links to local freeze odds, a live 10-day outlook, and a checklist.

Notable cities

All Illinois cities

CityLocal deadlineMedian first 28°F
SchaumburgOct 17Oct 24View →Checklist
Hoffman EstatesOct 17Oct 24View →Checklist
BartlettOct 17Oct 24View →Checklist
StreamwoodOct 17Oct 24View →Checklist
Hanover ParkOct 17Oct 24View →Checklist
NapervilleOct 19Oct 26View →Checklist
WheatonOct 19Oct 26View →Checklist
Downers GroveOct 19Oct 26View →Checklist
LombardOct 19Oct 26View →Checklist
NormalOct 20Oct 27View →Checklist
RockfordOct 21Oct 28View →Checklist
DeKalbOct 21Oct 28View →Checklist
ElginOct 22Oct 29View →Checklist
Carol StreamOct 22Oct 29View →Checklist
CarpentersvilleOct 22Oct 29View →Checklist
WaukeganOct 23Oct 30View →Checklist
BloomingtonOct 23Oct 30View →Checklist
PalatineOct 23Oct 30View →Checklist
Tinley ParkOct 23Oct 30View →Checklist
BellevilleOct 23Oct 30View →Checklist
Calumet CityOct 23Oct 30View →Checklist
MolineOct 24Oct 31View →Checklist
Rock IslandOct 24Oct 31View →Checklist
SpringfieldOct 25Nov 1View →Checklist
EvanstonOct 25Nov 1View →Checklist
BolingbrookOct 25Nov 1View →Checklist
SkokieOct 25Nov 1View →Checklist
Orland ParkOct 25Nov 1View →Checklist
GlenviewOct 25Nov 1View →Checklist
PlainfieldOct 25Nov 1View →Checklist
Crystal LakeOct 25Nov 1View →Checklist
RomeovilleOct 25Nov 1View →Checklist
AuroraOct 26Nov 2View →Checklist
PeoriaOct 26Nov 2View →Checklist
ChampaignOct 26Nov 2View →Checklist
UrbanaOct 26Nov 2View →Checklist
DecaturOct 27Nov 3View →Checklist
JolietOct 28Nov 4View →Checklist
Arlington HeightsOct 31Nov 7View →Checklist
Des PlainesOct 31Nov 7View →Checklist
Mount ProspectOct 31Nov 7View →Checklist
ElmhurstOct 31Nov 7View →Checklist
Buffalo GroveOct 31Nov 7View →Checklist
WheelingOct 31Nov 7View →Checklist
Park RidgeOct 31Nov 7View →Checklist
AddisonOct 31Nov 7View →Checklist
QuincyNov 1Nov 8View →Checklist
CiceroNov 4Nov 11View →Checklist
Oak LawnNov 4Nov 11View →Checklist
BerwynNov 4Nov 11View →Checklist
Oak ParkNov 4Nov 11View →Checklist
ChicagoNov 8Nov 15View →Checklist

Back to the national Boat Winterization guide, or see the methodology.

Data: NOAA NCEI 1991–2020 U.S. Climate Normals; live outlook by Open-Meteo. Last updated: July 11, 2026.