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Illinois frost dates by weather station

Illinois has 170 NOAA weather stations with 1991–2020 freeze statistics. Median last spring frost dates run from Apr 2 at Cairo 3n to May 2 at Mount Carroll.

170Stations
Apr 2Earliest last frostCairo 3n
May 2Latest last frostMount Carroll
216 daysLongest growing seasonGrand Chain Dam 53

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Illinois stations: median (50%) frost dates at 32°F
Station	Last spring frost	First fall frost	Growing season	Elevation
Albion	Apr 4	Oct 28	206 days	530 ft
Aledo	Apr 22	Oct 19	181 days	730 ft
Alton - Melvin Price L&d	Apr 4	Nov 5	214 days	405 ft
Altona	Apr 28	Oct 12	165 days	765 ft
Anna 2 NNE	Apr 8	Oct 29	203 days	640 ft
Antioch	Apr 23	Oct 21	179 days	750 ft
Athens 4sw	Apr 19	Oct 19	181 days	594 ft
Aurora	Apr 19	Oct 23	185 days	660 ft
Avon	Apr 22	Oct 19	177 days	640 ft
Barrington 3sw	Apr 25	Oct 19	177 days	875 ft
Belleville Siu Rsch	Apr 12	Oct 20	189 days	450 ft
Bentley	Apr 13	Oct 22	191 days	650 ft
Benton 2 N	Apr 4	Oct 28	206 days	445 ft
Bloomington 5w	Apr 21	Oct 20	181 days	852 ft
Brookport Dam 52	Apr 6	Oct 27	203 days	330 ft
Brownstown 4 SW	Apr 3	Oct 24	202 days	530 ft
Cahokia	Apr 6	Oct 27	203 days	400 ft
Cahokia St. Louis Airport	Apr 8	Oct 26	200 days	413 ft
Cairo 3n	Apr 2	Oct 31	211 days	313 ft
Carbondale Sewage Plant	Apr 9	Oct 22	195 days	390 ft
Carbondale Southern Il Airport	Apr 9	Oct 22	195 days	406 ft
Carlinville	Apr 14	Oct 21	188 days	621 ft
Carlyle Rsvr	Apr 6	Oct 29	204 days	501 ft
Carmi 3	Apr 15	Oct 19	183 days	335 ft
Casey	Apr 14	Oct 20	187 days	620 ft
Champaign 3s	Apr 15	Oct 24	190 days	721 ft
Champaign 9 SW	Apr 23	Oct 13	170 days	700 ft
Champaign Willard Airport	Apr 19	Oct 17	180 days	754 ft
Channahon Dresden Isl Dam	Apr 16	Oct 26	191 days	505 ft
Charleston	Apr 15	Oct 23	187 days	700 ft
Chenoa	Apr 23	Oct 15	174 days	719 ft
Chicago Aurora Muni Airport	Apr 28	Oct 13	166 days	710 ft
Chicago Botanic Garden	Apr 26	Oct 21	176 days	630 ft
Chicago Midway Airport	Apr 11	Oct 31	201 days	612 ft
Chicago Midway Airport 3sw	Apr 10	Nov 1	203 days	620 ft
Chicago Northerly Island	Apr 10	Nov 5	208 days	583 ft
Chicago Ohare Intl Airport	Apr 16	Oct 28	193 days	658 ft
Chicago Palwaukee Airport	Apr 19	Oct 26	190 days	636 ft
Chicago Waukegan Regional Airport	Apr 30	Oct 21	173 days	727 ft
Compton 1 NW	Apr 27	Oct 12	167 days	905 ft
Congerville 2nw	Apr 21	Oct 17	178 days	640 ft
Crystal Lake 4nw	Apr 25	Oct 22	179 days	940 ft
Danville	Apr 21	Oct 20	181 days	555 ft
De Kalb	Apr 24	Oct 18	177 days	873 ft
Decatur Airport	Apr 16	Oct 22	187 days	675 ft
Decatur Water Plant	Apr 14	Oct 24	192 days	639 ft
Dixon 1w	Apr 21	Oct 19	180 days	660 ft
Dixon Springs Agric Center	Apr 14	Oct 21	189 days	527 ft
Du Quoin 4 SE	Apr 6	Oct 22	199 days	420 ft
Dwight	Apr 27	Oct 15	170 days	628 ft
Effingham 3sw	Apr 13	Oct 24	191 days	625 ft
Elgin	Apr 26	Oct 18	174 days	763 ft
Elizabeth	May 1	Oct 9	160 days	675 ft
Fairfield Radio Wfiw	Apr 7	Oct 26	201 days	430 ft
Flora	Apr 9	Oct 24	198 days	481 ft
Flora 5 NW	Apr 10	Oct 23	196 days	500 ft
Freeport Waste Water Plant	Apr 26	Oct 13	169 days	750 ft
Fulton L&d #13	Apr 13	Oct 26	195 days	592 ft
Galena	Apr 26	Oct 15	170 days	822 ft
Galesburg	Apr 20	Oct 19	180 days	761 ft
Galva	Apr 26	Oct 12	166 days	810 ft
Geneseo	Apr 20	Oct 20	180 days	639 ft
Gibson City	Apr 21	Oct 17	178 days	750 ft
Gladstone Dam 18	Apr 8	Oct 29	202 days	538 ft
Golden	Apr 18	Oct 21	187 days	718 ft
Grand Chain Dam 53	Apr 3	Nov 5	216 days	385 ft
Grayville	Apr 7	Oct 25	201 days	435 ft
Harrisburg	Apr 7	Oct 26	202 days	365 ft
Havana	Apr 17	Oct 19	185 days	463 ft
Hennepin	Apr 18	Oct 22	188 days	515 ft
Hennepin Wtr Trmt Plant	Apr 24	Oct 17	174 days	460 ft
Hillsboro	Apr 13	Oct 24	192 days	630 ft
Hoopeston	Apr 22	Oct 19	180 days	710 ft
Illinois City Dam 16	Apr 18	Oct 24	188 days	550 ft
Iuka 12 SW	Apr 9	Oct 24	196 days	590 ft
Jacksonville 2	Apr 17	Oct 21	186 days	626 ft
Jacksonville 2e	Apr 19	Oct 17	179 days	610 ft
Jerseyville 2 SW	Apr 14	Oct 19	187 days	630 ft
Joliet Brandon Rd Dam	Apr 19	Oct 25	188 days	543 ft
Kankakee Metro Wastewater	Apr 19	Oct 24	188 days	600 ft
Kaskaskia River Navigation Lock	Apr 8	Oct 30	202 days	380 ft
Kewanee 1 E	Apr 24	Oct 17	175 days	780 ft
Knoxville	Apr 21	Oct 20	181 days	728 ft
La Harpe	Apr 21	Oct 19	180 days	690 ft
Lacon	Apr 20	Oct 17	178 days	458 ft
Lake Villa 2ne	Apr 24	Oct 23	180 days	840 ft
Lawrenceville 2wsw	Apr 12	Oct 25	193 days	451 ft
Lawrenceville Intl Airport	Apr 8	Oct 26	200 days	429 ft
Lincoln	Apr 20	Oct 16	179 days	583 ft
Lisle-Morton Arboretum	Apr 28	Oct 16	169 days	680 ft
Little Red School Hse	Apr 19	Oct 22	183 days	715 ft
Marengo	Apr 28	Oct 12	166 days	815 ft
Marseilles Lock	Apr 27	Oct 17	171 days	490 ft
Mason City 4se	Apr 17	Oct 18	182 days	600 ft
Mattoon	Apr 11	Oct 29	199 days	701 ft
Mattoon Coles Co Airport	Apr 15	Oct 24	189 days	721 ft
Mc Henry -Wg Stratton L&d	May 1	Oct 11	162 days	736 ft
McLeansboro	Apr 11	Oct 21	190 days	446 ft
Minonk	Apr 26	Oct 17	173 days	750 ft
Moline Quad City Intl Airport	Apr 24	Oct 18	176 days	592 ft
Monmouth	Apr 22	Oct 15	174 days	720 ft
Monmouth 4nw	Apr 22	Oct 14	174 days	724 ft
Morris 1 NW	Apr 20	Oct 23	184 days	524 ft
Morrison	Apr 26	Oct 13	167 days	632 ft
Morrisonville	Apr 12	Oct 20	190 days	630 ft
Mount Carmel	Apr 2	Oct 31	209 days	430 ft
Mount Carroll	May 2	Oct 7	154 days	640 ft
Mount Vernon 3 NE	Apr 11	Oct 22	193 days	490 ft
Mundelein 4 WSW	Apr 29	Oct 20	172 days	840 ft
Nashville 1 E	Apr 7	Oct 26	201 days	513 ft
Neoga 4nw	Apr 16	Oct 20	185 days	643 ft
New Boston Dam 17	Apr 14	Oct 24	190 days	548 ft
Newton	Apr 13	Oct 22	190 days	531 ft
Newton 6 SSE	Apr 13	Oct 22	191 days	510 ft
Normal 4ne	Apr 25	Oct 16	172 days	790 ft
Ogden	Apr 20	Oct 21	182 days	675 ft
Olney 2s	Apr 15	Oct 23	189 days	459 ft
Ottawa 5sw	Apr 20	Oct 22	183 days	525 ft
Palestine	Apr 12	Oct 22	193 days	450 ft
Pana	Apr 17	Oct 23	188 days	650 ft
Paris Stp	Apr 21	Oct 20	179 days	649 ft
Park Forest	Apr 23	Oct 20	179 days	710 ft
Paw Paw 2s	Apr 27	Oct 15	171 days	889 ft
Paxton 2 WSW	Apr 23	Oct 12	170 days	758 ft
Peoria Gtr Peoria Airport	Apr 16	Oct 23	189 days	650 ft
Perry 6 NW	Apr 18	Oct 15	179 days	650 ft
Peru	Apr 24	Oct 18	176 days	620 ft
Petersburg 1e	Apr 13	Oct 21	189 days	600 ft
Piper City	Apr 25	Oct 20	175 days	670 ft
Pittsfield #2	Apr 14	Oct 21	189 days	670 ft
Polo 5nw	Apr 29	Oct 7	161 days	856 ft
Pontiac	Apr 16	Oct 24	191 days	650 ft
Prairie City 2s	Apr 17	Oct 22	185 days	650 ft
Princeton	Apr 22	Oct 17	177 days	697 ft
Princeville	Apr 22	Oct 14	174 days	750 ft
Quincy Dam 21	Apr 8	Oct 30	204 days	483 ft
Quincy Regional Airport	Apr 14	Oct 23	191 days	769 ft
Ramsey	Apr 15	Oct 19	185 days	600 ft
Rantoul	Apr 21	Oct 18	179 days	740 ft
Rend Lake Dam	Apr 4	Oct 27	204 days	455 ft
Robinson	Apr 13	Oct 22	190 days	535 ft
Rochelle	Apr 26	Oct 13	168 days	775 ft
Rock Island L&d 15	Apr 19	Oct 22	184 days	568 ft
Rockford Gtr Rockford Airport	Apr 24	Oct 17	174 days	730 ft
Romeoville WFO	Apr 20	Oct 22	184 days	660 ft
Rosiclare 5nw	Apr 19	Oct 20	181 days	400 ft
Rushville	Apr 16	Oct 23	189 days	673 ft
Salem	Apr 9	Oct 26	197 days	550 ft
Shabbona 5 NNE	Apr 28	Oct 10	163 days	861 ft
Shelbyville Dam	Apr 10	Oct 24	195 days	650 ft
Sidell 4n	Apr 19	Oct 19	181 days	672 ft
Smithland L&d	Apr 3	Oct 30	207 days	357 ft
Sparta 1 W	Apr 12	Oct 22	191 days	535 ft
Springfield #2	Apr 15	Oct 22	188 days	599 ft
Springfield Capital Airport	Apr 14	Oct 20	187 days	594 ft
Stockton 3 NNE	Apr 27	Oct 9	165 days	970 ft
Streamwood	Apr 30	Oct 13	163 days	819 ft
Streator 3 SE	Apr 12	Oct 28	199 days	610 ft
Sullivan 3s	Apr 15	Oct 22	187 days	640 ft
Tuscola	Apr 15	Oct 20	188 days	651 ft
Vandalia	Apr 10	Oct 24	196 days	490 ft
Virden	Apr 7	Oct 29	205 days	675 ft
Walnut	Apr 24	Oct 14	172 days	671 ft
Watseka 2 NW	Apr 24	Oct 16	174 days	620 ft
Waukegan	Apr 30	Oct 19	170 days	700 ft
West Chicago Dupage Airport	Apr 25	Oct 19	174 days	754 ft
Wheaton 3 SE	Apr 27	Oct 17	173 days	680 ft
White Hall 1 E	Apr 13	Oct 22	190 days	580 ft
Winchester	Apr 18	Oct 20	183 days	551 ft
Windsor	Apr 16	Oct 22	187 days	690 ft

Sources

NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.

Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.