Illinois Frost Dates

The median last spring freeze and first fall freeze (32°F) at 170 NOAA stations in Illinois, 1991-2020, with the growing season between them.

Every station

A median date has an even chance of a later freeze in spring or an earlier one in fall. Each town page gives the dates at 36, 32 and 28°F and every probability from 10 to 90 percent.

Station	Elevation	Last freeze	First freeze	Season, days	Town page
Albion	530 ft	April 4	October 28	207	Albion
Aledo	730 ft	April 22	October 19	180	Aledo
Alton - Melvin Price L&d	405 ft	April 4	November 5	215	East Alton
Altona	765 ft	April 28	October 12	167	Altona
Anna 2 Nne	640 ft	April 8	October 29	204	Anna
Antioch	750 ft	April 23	October 21	181	Antioch
Athens 4SW	594 ft	April 19	October 19	183	Athens
Aurora	660 ft	April 19	October 23	187	Aurora
Avon	640 ft	April 22	October 19	180	Avon
Barrington 3SW	875 ft	April 25	October 19	177	Barrington Hills
Belleville Siu Rsch	450 ft	April 12	October 20	191	Scott Air Force Base
Bentley	650 ft	April 13	October 22	192	Carthage
Benton 2 N	445 ft	April 4	October 28	207	Benton
Bloomington 5W	852 ft	April 21	October 20	182	Twin Grove
Brookport Dam 52	330 ft	April 6	October 27	204	Brookport
Brownstown 4 Sw	530 ft	April 3	October 24	204	Brownstown
Cahokia	400 ft	April 6	October 27	204	Cahokia
Cahokia St Louis AP	413 ft	April 8	October 26	201	Cahokia
Cairo 3N	313 ft	April 2	October 31	212	Cairo
Carbondale Sewage Plt	390 ft	April 9	October 22	196	Carbondale
Carbondale Southern Il AP	406 ft	April 9	October 22	196	De Soto
Carlinville	621 ft	April 14	October 21	190	Carlinville
Carlyle Rsvr	501 ft	April 6	October 29	206	Carlyle
Carmi 3	335 ft	April 15	October 19	187	Carmi
Casey	620 ft	April 14	October 20	189	Casey
Champaign 3S	721 ft	April 15	October 24	192	Savoy
Champaign 9 Sw	700 ft	April 23	October 13	173	Savoy
Champaign Willard AP	754 ft	April 19	October 17	181	Savoy
Channahon Dresden Isl Dam	505 ft	April 16	October 26	193	Channahon
Charleston	700 ft	April 15	October 23	191	Charleston
Chenoa	719 ft	April 23	October 15	175	Chenoa
Chicago Aurora Muni AP	710 ft	April 28	October 13	168	Sugar Grove
Chicago Botanic Garden	630 ft	April 26	October 21	178	Glencoe
Chicago Midway AP	612 ft	April 11	October 31	203	West Elsdon
Chicago Midway AP 3SW	620 ft	April 10	November 1	205	Burbank
Chicago Northerly Is	583 ft	April 10	November 5	209	Near South Side
Chicago Ohare Intl AP	658 ft	April 16	October 28	195	Elk Grove Village
Chicago Palwaukee AP	636 ft	April 19	October 26	190	Wheeling
Chicago Waukegan Rgnl AP	727 ft	April 30	October 21	174	Beach Park
Compton 1 Nw	905 ft	April 27	October 12	168	Paw Paw
Congerville 2NW	640 ft	April 21	October 17	179	Goodfield
Crystal Lake 4NW	940 ft	April 25	October 22	180	Lakewood
Danville	555 ft	April 21	October 20	182	Danville
De Kalb	873 ft	April 24	October 18	177	DeKalb
Decatur AP	675 ft	April 16	October 22	189	Long Creek
Decatur Wtp	639 ft	April 14	October 24	193	Decatur
Dixon 1W	660 ft	April 21	October 19	181	Dixon
Dixon Springs Agric Ctr	527 ft	April 14	October 21	190	Golconda
Du Quoin 4 Se	420 ft	April 6	October 22	199	Du Quoin
Dwight	628 ft	April 27	October 15	171	Dwight
Effingham 3SW	625 ft	April 13	October 24	194	Effingham
Elgin	763 ft	April 26	October 18	175	Elgin
Elizabeth	675 ft	May 1	October 9	161	Elizabeth
Fairfield Radio Wfiw	430 ft	April 7	October 26	202	Fairfield
Flora	481 ft	April 9	October 24	198	Flora
Flora 5 Nw	500 ft	April 10	October 23	196	Flora
Freeport Waste Wtp	750 ft	April 26	October 13	170	Freeport
Fulton L&d #13	592 ft	April 13	October 26	196	Fulton
Galena	822 ft	April 26	October 15	172	Galena
Galesburg	761 ft	April 20	October 19	182	Galesburg
Galva	810 ft	April 26	October 12	169	Galva
Geneseo	639 ft	April 20	October 20	183	Geneseo
Gibson City	750 ft	April 21	October 17	179	Gibson City
Gladstone Dam 18	538 ft	April 8	October 29	204	Oquawka
Golden	718 ft	April 18	October 21	186	Golden
Grand Chain Dam 53	385 ft	April 3	November 5	216
Grayville	435 ft	April 7	October 25	201	Grayville
Harrisburg	365 ft	April 7	October 26	202	Harrisburg
Havana	463 ft	April 17	October 19	185	Havana
Hennepin	515 ft	April 18	October 22	187	Hennepin
Hennepin Wtr Trmt Plt	460 ft	April 24	October 17	176	Hennepin
Hillsboro	630 ft	April 13	October 24	194	Hillsboro
Hoopeston	710 ft	April 22	October 19	180	Hoopeston
Illinois City Dam 16	550 ft	April 18	October 24	189
Iuka 12 Sw	590 ft	April 9	October 24	198	Centralia
Jacksonville 2	626 ft	April 17	October 21	187	South Jacksonville
Jacksonville 2E	610 ft	April 19	October 17	181	Jacksonville
Jerseyville 2 Sw	630 ft	April 14	October 19	188	Jerseyville
Joliet Brandon Rd Dam	543 ft	April 19	October 25	189	Rockdale
Kankakee Metro Wastewater	600 ft	April 19	October 24	188	Bourbonnais
Kaskaskia Rvr Navigation Lock	380 ft	April 8	October 30	205
Kewanee 1 E	780 ft	April 24	October 17	176	Kewanee
Knoxville	728 ft	April 21	October 20	182	Knoxville
La Harpe	690 ft	April 21	October 19	181	La Harpe
Lacon	458 ft	April 20	October 17	180	Lacon
Lake Villa 2NE	840 ft	April 24	October 23	182	Lake Villa
Lawrenceville 2WSW	451 ft	April 12	October 25	196	Lawrenceville
Lawrenceville Intl AP	429 ft	April 8	October 26	201	Lawrenceville
Lincoln	583 ft	April 20	October 16	179	Lincoln
Lisle-Morton Arboretum	680 ft	April 28	October 16	171	Lisle
Little Red School Hse	715 ft	April 19	October 22	186	Willow Springs
Marengo	815 ft	April 28	October 12	167	Marengo
Marseilles Lock	490 ft	April 27	October 17	173	Marseilles
Mason City 4SE	600 ft	April 17	October 18	184	Mason City
Mattoon	701 ft	April 11	October 29	201	Mattoon
Mattoon Coles CO AP	721 ft	April 15	October 24	192	Mattoon
Mc Henry -Wg Stratton L&d	736 ft	May 1	October 11	163	McHenry
Mcleansboro	446 ft	April 11	October 21	193	McLeansboro
Minonk	750 ft	April 26	October 17	174	Minonk
Moline Quad City Intl AP	592 ft	April 24	October 18	177	Milan
Monmouth	720 ft	April 22	October 15	176	Monmouth
Monmouth 4NW	724 ft	April 22	October 14	175	Monmouth
Morris 1 Nw	524 ft	April 20	October 23	186	Morris
Morrison	632 ft	April 26	October 13	170	Morrison
Morrisonville	630 ft	April 12	October 20	191	Morrisonville
Mt Carmel	430 ft	April 2	October 31	212	Mount Carmel
Mt Carroll	640 ft	May 2	October 7	158	Mount Carroll
Mt Vernon 3 Ne	490 ft	April 11	October 22	194	Mount Vernon
Mundelein 4 Wsw	840 ft	April 29	October 20	174	Fairfield
Nashville 1 E	513 ft	April 7	October 26	202	Nashville
Neoga 4NW	643 ft	April 16	October 20	187	Neoga
New Boston Dam 17	548 ft	April 14	October 24	193	New Boston
Newton	531 ft	April 13	October 22	192	Newton
Newton 6 Sse	510 ft	April 13	October 22	192	Newton
Normal 4NE	790 ft	April 25	October 16	174	Normal
Ogden	675 ft	April 20	October 21	184	Ogden
Olney 2S	459 ft	April 15	October 23	191	Olney
Ottawa 5SW	525 ft	April 20	October 22	185	Ottawa
Palestine	450 ft	April 12	October 22	193	Palestine
Pana	650 ft	April 17	October 23	189	Pana
Paris Stp	649 ft	April 21	October 20	182	Paris
Park Forest	710 ft	April 23	October 20	180	Park Forest
Paw Paw 2S	889 ft	April 27	October 15	171	Paw Paw
Paxton 2 Wsw	758 ft	April 23	October 12	172	Paxton
Peoria Gtr Peoria AP	650 ft	April 16	October 23	190	Bellevue
Perry 6 Nw	650 ft	April 18	October 15	180	Griggsville
Peru	620 ft	April 24	October 18	177	La Salle
Petersburg 1E	600 ft	April 13	October 21	191	Petersburg
Piper City	670 ft	April 25	October 20	178	Piper City
Pittsfield #2	670 ft	April 14	October 21	190	Pittsfield
Polo 5NW	856 ft	April 29	October 7	161	Polo
Pontiac	650 ft	April 16	October 24	191	Pontiac
Prairie City 2S	650 ft	April 17	October 22	188	Bushnell
Princeton	697 ft	April 22	October 17	178	Princeton
Princeville	750 ft	April 22	October 14	175	Princeville
Quincy Dam 21	483 ft	April 8	October 30	205	Quincy
Quincy Rgnl AP	769 ft	April 14	October 23	192	Liberty
Ramsey	600 ft	April 15	October 19	187	Ramsey
Rantoul	740 ft	April 21	October 18	180	Rantoul
Rend Lake Dam	455 ft	April 4	October 27	206	Valier
Robinson	535 ft	April 13	October 22	192	Robinson
Rochelle	775 ft	April 26	October 13	170	Rochelle
Rock Island L&d 15	568 ft	April 19	October 22	186
Rockford Gtr Rockford AP	730 ft	April 24	October 17	176	New Milford
Romeoville WFO	660 ft	April 20	October 22	185	Lockport
Rosiclare 5NW	400 ft	April 19	October 20	184	Rosiclare
Rushville	673 ft	April 16	October 23	190	Rushville
Salem	550 ft	April 9	October 26	200	Salem
Shabbona 5 Nne	861 ft	April 28	October 10	165	Shabbona
Shelbyville Dam	650 ft	April 10	October 24	197	Shelbyville
Sidell 4N	672 ft	April 19	October 19	183	Sidell
Smithland L&d	357 ft	April 3	October 30	210
Sparta 1 W	535 ft	April 12	October 22	193	Sparta
Springfield #2	599 ft	April 15	October 22	190	Leland Grove
Springfield Capital AP	594 ft	April 14	October 20	189	Springfield
Stockton 3 Nne	970 ft	April 27	October 9	165	Stockton
Streamwood	819 ft	April 30	October 13	166	Streamwood
Streator 3 Se	610 ft	April 12	October 28	199	Streator
Sullivan 3S	640 ft	April 15	October 22	190	Sullivan
Tuscola	651 ft	April 15	October 20	188	Tuscola
Vandalia	490 ft	April 10	October 24	197	Vandalia
Virden	675 ft	April 7	October 29	205	Virden
Walnut	671 ft	April 24	October 14	173	Walnut
Watseka 2 Nw	620 ft	April 24	October 16	175	Watseka
Waukegan	700 ft	April 30	October 19	172	Park City
West Chicago Dupage AP	754 ft	April 25	October 19	177	Wayne
Wheaton 3 Se	680 ft	April 27	October 17	173	Lisle
White Hall 1 E	580 ft	April 13	October 22	192	White Hall
Winchester	551 ft	April 18	October 20	185	Winchester
Windsor	690 ft	April 16	October 22	189	Windsor

Sources

NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal freeze probabilities. Public domain.