When is the last frost in Montana?

It varies by location. Across Montana, average last spring frost dates range from April 30 (Cardwell) to June 16 (Mc Allister). Look up your ZIP code for your local date.

Why do nearby towns have different frost dates?

Elevation, distance from large bodies of water, and whether a weather station sits in a valley, on a hill, or in a city all change how cold nights get. Each ZIP code is matched to the most representative nearby NOAA station.

Montana frost dates

Average last spring and first fall frost (32°F) dates for 360 cities and towns in Montana, from NOAA 1991-2020 climate normals. Average last frost dates range from April 30 in Cardwell to June 16 in Mc Allister. Open a ZIP code for frost risk by date and a planting calendar.

Cities with several ZIP codes use the first-listed ZIP. Open a ZIP for exact local dates.
City	Avg last frost	Avg first frost	Season	ZIP codes
Absarokee	Jun 1	Sep 11	100 days	59001
Acton	May 4	Oct 7	156 days	59002
Alberton	May 18	Sep 25	126 days	59820
Alder	Jun 6	Sep 14	98 days	59710
Alzada	Jun 2	Sep 6	95 days	59311
Anaconda	Jun 1	Sep 14	105 days	59711
Angela	May 15	Sep 25	132 days	59312
Antelope	May 25	Sep 14	111 days	59211
Arlee	May 12	Oct 2	142 days	59821
Ashland	May 18	Sep 22	126 days	59003, 59004
Augusta	May 19	Sep 21	125 days	59410
Avon	Jun 4	Sep 14	100 days	59713
Babb	Jun 12	Sep 5	82 days	59411
Bainville	May 21	Sep 20	120 days	59212
Baker	May 16	Sep 26	132 days	59313
Ballantine	May 12	Sep 25	136 days	59006
Basin	Jun 7	Sep 8	90 days	59631
Bearcreek	May 18	Sep 22	125 days	59007
Belfry	May 18	Sep 22	125 days	59008
Belgrade	May 26	Sep 16	112 days	59714
Belt	May 22	Sep 23	123 days	59412
Biddle	May 14	Sep 28	134 days	59314
Big Arm	May 10	Oct 5	147 days	59910
Big Sandy	May 17	Sep 25	128 days	59520
Big Sky	Any month	—	50 days	59716
Big Timber	May 14	Sep 26	133 days	59011
Bigfork	May 12	Sep 25	134 days	59911
Bighorn	May 26	Sep 16	111 days	59010
Billings	May 10	Oct 1	142 days	59101, 59102, 59103, 59104 +10 more
Birney	May 23	Sep 15	113 days	59012
Black Eagle	May 19	Sep 24	126 days	59414
Bloomfield	May 17	Sep 22	126 days	59315
Bonner	May 10	Oct 1	143 days	59823
Boulder	Jun 7	Sep 8	90 days	59632
Box Elder	May 17	Sep 25	128 days	59521
Boyd	May 29	Sep 15	107 days	59013
Boyes	May 16	Sep 28	135 days	59316
Bozeman	May 26	Sep 22	116 days	59715, 59717, 59718, 59719 +2 more
Brady	May 20	Sep 19	119 days	59416
Bridger	May 14	Sep 24	129 days	59014
Broadus	May 14	Sep 28	134 days	59317
Broadview	May 22	Sep 15	114 days	59015
Brockton	May 24	Sep 14	110 days	59213
Brockway	May 20	Sep 19	121 days	59214
Browning	Jun 8	Sep 5	88 days	59417
Brusett	May 18	Sep 20	123 days	59318
Buffalo	May 28	Sep 20	112 days	59418
Busby	May 23	Sep 15	113 days	59016
Butte	Jun 13	Sep 5	83 days	59701, 59702, 59703, 59707 +1 more
Bynum	May 28	Sep 12	104 days	59419
Cameron	Jun 4	Sep 18	106 days	59720
Canyon Creek	Jun 4	Sep 14	100 days	59633
Capitol	May 17	Sep 24	128 days	59319
Cardwell	Apr 30	Oct 10	162 days	59721
Carter	May 23	Sep 23	120 days	59420
Cascade	May 21	Sep 19	120 days	59421
Charlo	May 12	Oct 2	142 days	59824
Chester	May 24	Sep 17	115 days	59522
Chinook	May 14	Sep 23	130 days	59523
Choteau	May 28	Sep 12	104 days	59422
Circle	May 17	Sep 22	126 days	59215
Clancy	May 9	Sep 30	142 days	59634
Clinton	Any month	—	45 days	59825
Clyde Park	May 27	Sep 14	108 days	59018
Coffee Creek	Jun 1	Sep 11	101 days	59424
Cohagen	May 25	Sep 14	110 days	59322
Colstrip	May 15	Sep 30	138 days	59323
Columbia Falls	May 31	Sep 10	100 days	59912
Columbus	May 27	Sep 14	108 days	59019
Condon	May 20	Sep 22	120 days	59826
Conner	Any month	—	59 days	59827
Conrad	May 20	Sep 19	119 days	59425
Cooke City	Any month	—	36 days	59020
Coram	May 18	Sep 20	124 days	59913
Corvallis	May 23	Sep 21	118 days	59828
Crane	May 12	Sep 25	135 days	59217
Crow Agency	May 13	Sep 29	135 days	59022
Culbertson	May 21	Sep 20	120 days	59218
Custer	May 10	Sep 29	141 days	59024
Cut Bank	May 24	Sep 15	113 days	59427
Dagmar	May 16	Sep 18	125 days	59219
Darby	May 24	Sep 23	118 days	59829
Dayton	May 1	Oct 15	165 days	59914
De Borgia	Any month	—	90 days	59830
Decker	May 21	Sep 23	123 days	59025
Deer Lodge	Any month	—	65 days	59722
Dell	Jun 11	Sep 10	89 days	59724
Denton	Jun 1	Sep 11	101 days	59430
Dillon	Jun 5	Sep 13	98 days	59725
Divide	Any month	—	27 days	59727
Dixon	May 12	Oct 2	142 days	59831
Dodson	May 10	Sep 29	139 days	59524
Drummond	Any month	—	80 days	59832
Dupuyer	Jun 9	Sep 3	86 days	59432
Dutton	May 20	Sep 19	119 days	59433
East Glacier Park	Jun 8	Sep 5	88 days	59434
East Helena	May 9	Sep 30	142 days	59635
Edgar	May 14	Sep 24	129 days	59026
Ekalaka	May 20	Sep 23	126 days	59324
Elliston	Jun 9	Sep 8	91 days	59728
Elmo	May 10	Oct 5	147 days	59915
Emigrant	May 21	Sep 27	128 days	59027
Ennis	Jun 16	Sep 4	78 days	59729
Essex	May 9	Oct 1	141 days	59916
Ethridge	May 23	Sep 16	115 days	59435
Eureka	May 11	Sep 27	138 days	59917
Fairfield	May 13	Sep 27	135 days	59436
Fairview	May 11	Sep 27	137 days	59221
Fallon	May 20	Sep 22	124 days	59326
Fishtail	Jun 3	Sep 19	106 days	59028
Flaxville	May 13	Sep 28	137 days	59222
Florence	May 22	Sep 19	115 days	59833
Floweree	May 23	Sep 23	120 days	59440
Forest Grove	May 23	Sep 21	119 days	59441
Forsyth	May 9	Sep 29	142 days	59327
Fort Benton	May 20	Sep 19	120 days	59442
Fort Harrison	May 9	Sep 30	142 days	59636
Fort Peck	May 8	Oct 1	145 days	59223
Fort Shaw	Jun 2	Sep 10	96 days	59443
Fort Smith	May 7	Oct 5	151 days	59035
Fortine	May 16	Sep 18	121 days	59918
Frazer	May 13	Sep 27	134 days	59225
Frenchtown	May 10	Oct 1	143 days	59834
Froid	May 16	Sep 18	125 days	59226
Fromberg	May 14	Sep 24	129 days	59029
Galata	May 23	Sep 14	112 days	59444
Gallatin Gateway	Any month	—	50 days	59730
Gardiner	Any month	—	64 days	59030
Garrison	Any month	—	65 days	59731
Garryowen	May 7	Oct 5	151 days	59031
Geraldine	May 14	Sep 26	134 days	59446
Geyser	May 22	Sep 23	123 days	59447
Gildford	May 24	Sep 15	114 days	59525
Glasgow	May 6	Sep 30	145 days	59230
Glen	Any month	—	71 days	59732
Glendive	May 3	Oct 4	153 days	59330
Glentana	Jun 5	Sep 2	89 days	59240
Gold Creek	Any month	—	80 days	59733
Grantsdale	May 21	Sep 22	122 days	59835
Grass Range	May 20	Sep 24	126 days	59032
Great Falls	May 19	Sep 24	126 days	59401, 59403, 59404, 59405 +1 more
Greycliff	May 14	Sep 26	133 days	59033
Hall	Any month	—	80 days	59837
Hamilton	May 21	Sep 22	122 days	59840
Hammond	May 17	Sep 22	127 days	59332
Hardin	May 13	Sep 29	135 days	59034
Harlem	May 16	Sep 21	125 days	59526
Harlowton	May 23	Sep 16	113 days	59036
Harrison	Apr 30	Oct 10	162 days	59735
Hathaway	May 8	Sep 30	144 days	59333
Haugan	Any month	—	90 days	59842
Havre	May 15	Sep 23	129 days	59501
Hays	May 18	Sep 23	126 days	59527
Heart Butte	Jun 8	Sep 5	88 days	59448
Helena	May 9	Sep 30	142 days	59601, 59602, 59604, 59620 +4 more
Helmville	Any month	—	67 days	59843
Heron	May 20	Sep 20	119 days	59844
Highwood	May 7	Oct 2	149 days	59450
Hilger	May 23	Sep 21	119 days	59451
Hingham	May 24	Sep 15	114 days	59528
Hinsdale	May 15	Sep 23	130 days	59241
Hobson	May 28	Sep 20	112 days	59452
Hogeland	May 19	Sep 21	124 days	59529
Homestead	May 16	Sep 18	125 days	59242
Hot Springs	May 10	Oct 5	147 days	59845
Hungry Horse	May 9	Oct 1	141 days	59919
Huntley	May 12	Sep 25	136 days	59037
Huson	May 18	Sep 25	126 days	59846
Hysham	May 10	Sep 29	141 days	59038
Ingomar	May 21	Sep 19	120 days	59039
Inverness	May 21	Sep 19	119 days	59530
Ismay	May 22	Sep 15	117 days	59336
Jackson	Any month	—	51 days	59736
Jefferson City	Jun 7	Sep 8	90 days	59638
Joliet	May 29	Sep 15	107 days	59041
Joplin	May 21	Sep 19	119 days	59531
Jordan	May 21	Sep 18	118 days	59337
Judith Gap	Jun 1	Sep 15	104 days	59453
Kalispell	May 31	Sep 10	100 days	59901, 59903, 59904
Kevin	May 23	Sep 16	115 days	59454
Kila	May 31	Sep 10	100 days	59920
Kinsey	May 8	Sep 30	144 days	59338
Kremlin	May 24	Sep 15	114 days	59532
Lake Mc Donald	May 9	Oct 1	141 days	59921
Lakeside	May 12	Sep 25	134 days	59922
Lambert	May 11	Sep 27	137 days	59243
Lame Deer	May 23	Sep 15	113 days	59043
Larslan	Jun 5	Sep 2	89 days	59244
Laurel	May 5	Oct 3	149 days	59044
Lavina	May 17	Sep 23	127 days	59046
Ledger	May 13	Sep 29	137 days	59456
Lewistown	May 23	Sep 21	119 days	59457
Libby	May 23	Sep 21	120 days	59923
Lima	Jun 11	Sep 10	89 days	59739
Lincoln	Any month	—	65 days	59639
Lindsay	May 26	Sep 17	113 days	59339
Livingston	May 27	Sep 14	108 days	59047
Lloyd	May 23	Sep 23	121 days	59535
Lodge Grass	May 23	Sep 15	113 days	59050
Lolo	May 16	Sep 26	130 days	59847
Loma	May 20	Sep 19	120 days	59460
Lonepine	May 15	Sep 28	134 days	59848
Loring	May 19	Sep 22	124 days	59537
Lothair	May 24	Sep 17	115 days	59461
Malmstrom Afb	May 19	Sep 24	126 days	59402
Malta	May 10	Sep 29	139 days	59538
Manhattan	May 26	Sep 16	112 days	59741
Marion	Any month	—	44 days	59925
Martin City	May 9	Oct 1	141 days	59926
Martinsdale	Any month	—	65 days	59053
Marysville	Jun 4	Sep 14	100 days	59640
Mc Allister	Jun 16	Sep 4	78 days	59740
Mc Leod	Jun 5	Sep 14	99 days	59052
Medicine Lake	May 16	Sep 18	125 days	59247
Melrose	Jun 10	Sep 7	85 days	59743
Melstone	May 10	Sep 29	141 days	59054
Melville	Jun 9	Sep 7	88 days	59055
Mildred	May 20	Sep 22	124 days	59341
Miles City	May 8	Sep 30	144 days	59301
Milltown	May 10	Oct 1	143 days	59851
Missoula	May 16	Sep 26	130 days	59801, 59802, 59803, 59804 +4 more
Moccasin	May 28	Sep 20	112 days	59462
Molt	May 24	Sep 21	116 days	59057
Monarch	Jun 6	Sep 12	99 days	59463
Moore	May 23	Sep 21	119 days	59464
Mosby	May 5	Oct 4	151 days	59058
Musselshell	May 10	Sep 29	141 days	59059
Nashua	May 12	Sep 24	134 days	59248
Neihart	Jun 6	Sep 12	99 days	59465
Norris	Apr 30	Oct 10	162 days	59745
Noxon	Any month	—	44 days	59853
Nye	Jun 1	Sep 11	100 days	59061
Oilmont	May 17	Sep 25	129 days	59466
Olive	May 16	Sep 28	135 days	59343
Olney	Any month	—	60 days	59927
Opheim	Jun 1	Sep 7	99 days	59250
Otter	May 25	Sep 19	115 days	59062
Outlook	May 19	Sep 23	125 days	59252
Ovando	Any month	—	67 days	59854
Pablo	May 10	Oct 5	147 days	59855
Paradise	Any month	—	101 days	59856
Park City	May 27	Sep 14	108 days	59063
Peerless	Jun 5	Sep 2	89 days	59253
Pendroy	Jun 9	Sep 3	86 days	59467
Philipsburg	Any month	—	65 days	59858
Pinesdale	May 23	Sep 21	118 days	59841
Plains	Any month	—	101 days	59859
Plentywood	May 25	Sep 14	111 days	59254
Plevna	May 21	Sep 20	121 days	59344
Polaris	Any month	—	51 days	59746
Polebridge	Any month	—	40 days	59928
Polson	May 10	Oct 5	147 days	59860
Pompeys Pillar	May 12	Sep 25	136 days	59064
Pony	Jun 4	Sep 18	106 days	59747
Poplar	May 24	Sep 14	110 days	59255
Powderville	May 13	Sep 25	132 days	59345
Power	Jun 2	Sep 10	96 days	59468
Pray	May 19	Sep 25	125 days	59065
Proctor	May 1	Oct 15	165 days	59929
Pryor	May 29	Sep 15	107 days	59066
Radersburg	May 19	Sep 19	122 days	59641
Ramsay	Jun 13	Sep 5	83 days	59748
Rapelje	May 24	Sep 21	116 days	59067
Ravalli	May 12	Oct 2	142 days	59863
Raymond	May 19	Sep 23	125 days	59256
Raynesford	May 22	Sep 23	123 days	59469
Red Lodge	Jun 3	Sep 19	106 days	59068
Redstone	May 28	Sep 7	101 days	59257
Reed Point	May 24	Sep 21	116 days	59069
Reserve	May 25	Sep 14	111 days	59258
Rexford	May 11	Sep 27	138 days	59930
Richey	May 16	Sep 22	129 days	59259
Richland	Jun 5	Sep 2	89 days	59260
Ringling	Any month	—	65 days	59642
Roberts	May 29	Sep 15	107 days	59070
Rollins	May 1	Oct 15	165 days	59931
Ronan	May 10	Oct 5	147 days	59864
Roscoe	Jun 3	Sep 19	106 days	59071
Rosebud	May 9	Sep 29	142 days	59347
Roundup	May 20	Sep 21	124 days	59072, 59073
Roy	May 14	Sep 24	134 days	59471
Rudyard	May 21	Sep 19	119 days	59540
Ryegate	May 17	Sep 23	127 days	59074
Saco	May 15	Sep 23	130 days	59261
Saint Ignatius	May 12	Oct 2	142 days	59865
Saint Marie	May 13	Sep 27	134 days	59231
Saint Regis	Any month	—	90 days	59866
Saint Xavier	May 7	Oct 5	151 days	59075
Saltese	Any month	—	90 days	59867
Sand Coulee	May 19	Sep 24	126 days	59472
Sand Springs	May 5	Oct 4	151 days	59077
Sanders	May 10	Sep 29	141 days	59076
Savage	May 12	Sep 25	135 days	59262
Scobey	May 28	Sep 6	99 days	59263
Seeley Lake	Any month	—	74 days	59868
Shawmut	May 23	Sep 16	113 days	59078
Shelby	May 23	Sep 16	115 days	59474
Shepherd	May 12	Sep 25	136 days	59079
Sheridan	May 24	Sep 22	117 days	59749
Sidney	May 11	Sep 27	137 days	59270
Silver Gate	Any month	—	36 days	59081
Silver Star	Jun 8	Sep 2	82 days	59751
Simms	Jun 2	Sep 10	96 days	59477
Somers	May 12	Sep 25	134 days	59932
Springdale	May 14	Sep 26	133 days	59082
Stanford	May 28	Sep 20	112 days	59479
Stevensville	May 22	Sep 19	115 days	59870
Stockett	May 22	Sep 23	123 days	59480
Stryker	Any month	—	60 days	59933
Sula	Any month	—	22 days	59871
Sumatra	May 10	Sep 29	141 days	59083
Sun River	Jun 2	Sep 10	96 days	59483
Sunburst	May 17	Sep 25	129 days	59482
Superior	May 17	Sep 23	125 days	59872
Sweet Grass	May 15	Sep 25	132 days	59484
Teigen	May 20	Sep 24	126 days	59084
Terry	May 12	Sep 28	137 days	59349
Thompson Falls	May 7	Oct 4	150 days	59873
Three Forks	May 9	Sep 27	139 days	59752
Toston	May 19	Sep 19	122 days	59643
Townsend	May 19	Sep 19	122 days	59644
Trego	May 16	Sep 18	121 days	59934
Trout Creek	May 20	Sep 21	122 days	59874
Troy	May 14	Sep 25	132 days	59935
Turner	May 19	Sep 21	124 days	59542
Twin Bridges	Jun 8	Sep 2	82 days	59754
Two Dot	May 23	Sep 16	113 days	59085
Ulm	Jun 2	Sep 10	96 days	59485
Valier	May 17	Sep 24	129 days	59486
Vandalia	May 3	Oct 1	151 days	59273
Vaughn	Jun 2	Sep 10	96 days	59487
Victor	May 23	Sep 21	118 days	59875
Vida	May 16	Sep 22	129 days	59274
Virginia City	Jun 4	Sep 18	106 days	59755
Volborg	May 16	Sep 28	135 days	59351
Warm Springs	Any month	—	65 days	59756
West Glacier	May 18	Sep 20	124 days	59936
West Yellowstone	Any month	—	33 days	59758
Westby	May 18	Sep 21	125 days	59275
White Sulphur Springs	Jun 4	Sep 11	97 days	59645
Whitefish	May 16	Sep 25	129 days	59937
Whitehall	Jun 8	Sep 2	82 days	59759
Whitetail	May 28	Sep 6	99 days	59276
Whitewater	May 15	Sep 23	130 days	59544
Whitlash	Any month	—	77 days	59545
Wibaux	May 27	Sep 16	112 days	59353
Willard	May 16	Sep 26	132 days	59354
Willow Creek	May 9	Sep 27	139 days	59760
Wilsall	Jun 4	Sep 6	92 days	59086
Winifred	May 16	Sep 23	127 days	59489
Winnett	May 16	Sep 28	132 days	59087
Winston	May 19	Sep 19	122 days	59647
Wisdom	Any month	—	22 days	59761
Wise River	Any month	—	27 days	59762
Wolf Creek	May 21	Sep 15	115 days	59648
Wolf Point	May 8	Sep 28	143 days	59201
Worden	May 12	Sep 25	136 days	59088
Wyola	May 21	Sep 17	117 days	59089
Zortman	May 12	Sep 27	136 days	59546
Zurich	May 14	Sep 23	130 days	59547

Frequently asked questions

When is the last frost in Montana?: It varies by location. Across Montana, average last spring frost dates range from April 30 (Cardwell) to June 16 (Mc Allister). Look up your ZIP code for your local date.
Why do nearby towns have different frost dates?: Elevation, distance from large bodies of water, and whether a weather station sits in a valley, on a hill, or in a city all change how cold nights get. Each ZIP code is matched to the most representative nearby NOAA station.