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Montana frost dates by weather station

Montana has 245 NOAA weather stations with 1991–2020 freeze statistics. Median last spring frost dates run from Apr 30 at Norris Madison Power House to Jun 18 at Tizer Gardens.

245Stations
Apr 30Earliest last frostNorris Madison Power House
Jun 18Latest last frostTizer Gardens
165 daysLongest growing seasonBigfork 13 S

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Montana stations: median (50%) frost dates at 32°F
Station	Last spring frost	First fall frost	Growing season	Elevation
Adel	Jun 4	Sep 12	98 days	5,017 ft
Alberton	May 18	Sep 25	126 days	3,060 ft
Albion 1 N	Jun 2	Sep 6	95 days	3,312 ft
Alder 17 S	Jun 6	Sep 14	98 days	5,850 ft
Alder 19s	any month	any month	77 days	5,749 ft
Anaconda	Jun 1	Sep 14	105 days	5,230 ft
Augusta	May 19	Sep 21	125 days	4,070 ft
Austin 1 W	Jun 4	Sep 14	100 days	4,851 ft
Baker	May 12	Sep 26	135 days	2,933 ft
Baker Muni Airport	May 16	Sep 26	132 days	2,971 ft
Biddle 8 SW	May 14	Sep 28	134 days	3,631 ft
Big Sandy	May 17	Sep 25	128 days	2,770 ft
Big Sky 2wnw	any month	any month	50 days	6,590 ft
Big Timber	May 14	Sep 26	133 days	4,100 ft
Bigfork 13 S	May 1	Oct 15	165 days	2,979 ft
Billings Logan Intl Airport	May 4	Oct 7	156 days	3,581 ft
Billings WFO	May 5	Oct 3	149 days	3,185 ft
Billings Water Plant	May 10	Oct 1	142 days	3,097 ft
Blackleaf	Jun 9	Sep 3	86 days	4,235 ft
Boulder	Jun 7	Sep 8	90 days	4,904 ft
Bozeman 6 W Exp. Farm	May 23	Sep 23	123 days	4,775 ft
Bozeman Gallatin Field	May 26	Sep 16	112 days	4,427 ft
Bozeman Montana State Univ	May 26	Sep 22	116 days	4,913 ft
Brady 27 ENE (the Knees)	May 13	Sep 29	137 days	3,325 ft
Brandenberg	May 18	Sep 22	126 days	2,770 ft
Bredette	May 20	Sep 21	122 days	2,313 ft
Bridger 2 N	May 14	Sep 24	129 days	3,583 ft
Broadus	May 16	Sep 28	135 days	3,032 ft
Brockway 3 WSW	May 20	Sep 19	121 days	2,630 ft
Busby	May 23	Sep 15	113 days	3,430 ft
Butte Bert Mooney Airport	Jun 13	Sep 5	83 days	5,506 ft
Bynum 4 SSE	May 16	Sep 27	133 days	4,039 ft
Carlyle 13 NW	May 18	Sep 29	134 days	3,145 ft
Carter 14 W	May 23	Sep 23	120 days	3,450 ft
Cascade 20 SSE	any month	any month	70 days	4,600 ft
Cascade 5 S	May 21	Sep 19	120 days	3,360 ft
Chester	May 24	Sep 17	115 days	3,132 ft
Chinook	May 14	Sep 23	130 days	2,420 ft
Chinook 35se	May 23	Sep 23	121 days	3,360 ft
Choteau	May 28	Sep 12	104 days	3,845 ft
Choteau 8ne	May 20	Sep 22	123 days	3,741 ft
Circle	May 17	Sep 22	126 days	2,480 ft
Cohagen	May 25	Sep 14	110 days	2,720 ft
Colstrip	May 15	Sep 30	138 days	3,218 ft
Columbus	May 27	Sep 14	108 days	3,602 ft
Conrad	May 20	Sep 19	119 days	3,550 ft
Content 4 NNE	May 25	Sep 14	110 days	2,325 ft
Cooke City 2 W	any month	any month	36 days	7,483 ft
Creston	May 12	Sep 25	134 days	2,935 ft
Culbertson	May 21	Sep 20	120 days	1,940 ft
Cut Bank Muni Airport	May 24	Sep 15	113 days	3,838 ft
Darby	May 24	Sep 23	118 days	3,880 ft
Deer Lodge 3 W	any month	any month	65 days	4,850 ft
Del Bonita	May 28	Sep 16	110 days	4,337 ft
Denton	Jun 1	Sep 11	101 days	3,610 ft
Dillon 18 WSW	any month	any month	72 days	5,971 ft
Dillon Airport	Jun 2	Sep 13	101 days	5,200 ft
Dillon U Of Montana Western	Jun 5	Sep 13	98 days	5,129 ft
Divide	Jun 10	Sep 7	85 days	5,350 ft
Drummond Aviation	any month	any month	80 days	4,000 ft
Dunkirk 19nne	May 23	Sep 14	112 days	3,323 ft
E Glacier	Jun 8	Sep 5	88 days	4,806 ft
Ekalaka	May 20	Sep 23	126 days	3,432 ft
Elliston	Jun 9	Sep 8	91 days	5,080 ft
Ennis	Jun 16	Sep 4	78 days	4,953 ft
Eureka Ranger Station	May 11	Sep 27	138 days	2,532 ft
Fairfield	May 13	Sep 27	135 days	3,983 ft
Flatwillow 4 ENE	May 16	Sep 28	132 days	3,292 ft
Forsyth	May 9	Sep 29	142 days	2,515 ft
Fort Assiniboine	May 15	Sep 24	130 days	2,675 ft
Fort Belknap 2 SW	May 16	Sep 22	128 days	2,527 ft
Fort Benton	May 15	Sep 22	129 days	2,649 ft
Fort Peck Power Plant	May 8	Oct 1	145 days	2,071 ft
Fortine 1 N	May 16	Sep 18	121 days	3,000 ft
Gardiner	May 21	Sep 27	128 days	5,275 ft
Geraldine	May 14	Sep 26	134 days	3,145 ft
Gibson 2 NE	May 27	Sep 18	113 days	4,444 ft
Gibson Dam	Jun 12	Sep 8	88 days	4,590 ft
Gildford	May 24	Sep 15	114 days	2,820 ft
Glasgow #2	May 3	Oct 1	151 days	2,090 ft
Glasgow Intl Airport	May 6	Sep 30	145 days	2,285 ft
Glen 4 N	any month	any month	71 days	5,054 ft
Glendive	May 3	Oct 4	153 days	2,075 ft
Goldbutte 7 N	any month	any month	77 days	3,498 ft
Grass Range	May 20	Sep 24	126 days	3,490 ft
Great Falls 16st	May 6	Oct 1	147 days	3,505 ft
Great Falls Intl Airport	May 19	Sep 24	126 days	3,664 ft
Great Falls WFO	May 12	Sep 28	138 days	3,705 ft
Hamilton	May 21	Sep 22	122 days	3,585 ft
Hardin	May 13	Sep 29	135 days	2,880 ft
Harlem	May 16	Sep 21	125 days	2,371 ft
Harlem 20s	May 24	Sep 22	118 days	2,695 ft
Harlowton	May 23	Sep 16	113 days	4,222 ft
Harlowton 11nw	May 30	Sep 20	110 days	4,954 ft
Haugan 1 W	any month	any month	90 days	3,160 ft
Havre City Co Airport	May 15	Sep 23	129 days	2,585 ft
Hebgen Dam	Jun 15	Sep 10	87 days	6,489 ft
Helena Regional Airport	May 9	Sep 30	142 days	3,828 ft
Heron 2 NW	May 20	Sep 20	119 days	2,240 ft
Highwood 7 NE	May 7	Oct 2	149 days	3,600 ft
Hinsdale 4 SW	May 15	Sep 26	132 days	2,805 ft
Holter Dam	May 19	Sep 24	124 days	3,487 ft
Hungry Horse Dam	May 9	Oct 1	141 days	3,160 ft
Huntley Exp. Station	May 12	Sep 25	136 days	3,034 ft
Hysham	May 10	Sep 29	141 days	2,669 ft
Hysham 25 SSE	May 26	Sep 16	111 days	3,100 ft
Ingomar 9 E	May 21	Sep 19	120 days	2,800 ft
Jackson	any month	any month	51 days	6,480 ft
Joliet	May 29	Sep 15	107 days	3,838 ft
Joplin	May 21	Sep 19	119 days	3,323 ft
Jordan	May 21	Sep 18	118 days	2,620 ft
Jordan Airport	May 18	Sep 20	123 days	2,662 ft
Judith Gap	Jun 1	Sep 15	104 days	4,630 ft
Judith Gap 13 E	Jun 3	Sep 15	100 days	4,791 ft
Kalispell Glacier Airport	May 31	Sep 10	100 days	2,957 ft
Lakeview	any month	any month	66 days	6,710 ft
Laurin 2ne	May 24	Sep 22	117 days	5,198 ft
Lennep 5 SW	any month	any month	65 days	5,600 ft
Lewistown	May 14	Sep 28	135 days	3,911 ft
Lewistown 11 SSE	May 31	Sep 14	105 days	4,965 ft
Lewistown 11ese	May 19	Sep 25	128 days	5,028 ft
Lewistown 42 WSW	Jun 15	Sep 4	77 days	5,070 ft
Lewistown Muni Airport	May 23	Sep 21	119 days	4,145 ft
Libby	May 10	Sep 26	137 days	2,140 ft
Libby 1 NE Ranger Station	May 23	Sep 21	120 days	2,096 ft
Libby 32 SSE	any month	any month	44 days	3,440 ft
Libby Dam (base)	May 11	Oct 1	142 days	2,110 ft
Lima	Jun 11	Sep 10	89 days	6,279 ft
Lincoln Ranger Station	any month	any month	65 days	4,575 ft
Lindbergh Lake	May 20	Sep 22	120 days	4,320 ft
Livingston 12 S	May 19	Sep 25	125 days	5,044 ft
Livingston Mission Field	May 27	Sep 14	108 days	4,643 ft
Logan Landfill	May 26	Sep 15	111 days	4,243 ft
Loma	May 20	Sep 19	120 days	2,578 ft
Malta	May 10	Sep 29	139 days	2,262 ft
Malta 35 S	May 16	Sep 23	128 days	2,615 ft
Malta 7 E	May 7	Sep 28	143 days	2,231 ft
Martinsdale 3 NNW	Jun 3	Sep 8	94 days	4,800 ft
Medicine Lake 3 SE	May 16	Sep 18	125 days	1,942 ft
Melstone	May 10	Sep 29	141 days	2,932 ft
Melville 4 W	Jun 9	Sep 7	88 days	5,365 ft
Mildred 5 N	May 20	Sep 22	124 days	2,482 ft
Miles City F Wiley Field	May 8	Sep 30	144 days	2,624 ft
Millegan 14 SE	Jun 11	Sep 6	86 days	4,970 ft
Missoula 2 NE	May 10	Oct 1	143 days	3,420 ft
Missoula 6 NW WFO	May 6	Oct 4	151 days	3,197 ft
Missoula Intl Airport	May 16	Sep 26	130 days	3,192 ft
Mizpah 4 NNW	May 22	Sep 15	117 days	2,480 ft
Moccasin Exp. Station	May 28	Sep 20	112 days	4,300 ft
Moorhead 9 NE	May 17	Sep 22	126 days	3,220 ft
Mosby 4 ENE	May 5	Oct 4	151 days	2,910 ft
Mystic Lake	Jun 5	Sep 14	99 days	6,544 ft
Nashua #2	May 12	Sep 24	134 days	2,067 ft
Neihart 8 NNW	Jun 6	Sep 12	99 days	5,230 ft
Norris Madison Power House	Apr 30	Oct 10	162 days	4,745 ft
Nye #2	Jun 1	Sep 11	100 days	4,840 ft
Olney	any month	any month	60 days	3,165 ft
Opheim 10 N	Jun 1	Sep 7	99 days	2,878 ft
Opheim 12 SSE	Jun 5	Sep 2	89 days	2,936 ft
Ovando 9 SSE	any month	any month	67 days	4,325 ft
Phillipsburg Ranger Station	any month	any month	65 days	5,270 ft
Plentywood	May 25	Sep 14	111 days	2,048 ft
Plevna	May 21	Sep 20	121 days	2,780 ft
Polebridge	any month	any month	40 days	3,520 ft
Polson	May 10	Oct 5	147 days	3,010 ft
Pompeys Pillar 15n	May 22	Sep 22	121 days	3,390 ft
Port Of Morgan	May 19	Sep 22	124 days	2,830 ft
Potomac	any month	any month	45 days	3,690 ft
Powderville 8 NNE	May 13	Sep 25	132 days	2,800 ft
Rapelje	May 24	Sep 21	116 days	4,068 ft
Raymond Border Station	May 19	Sep 23	125 days	2,345 ft
Raynesford 2 NNW	May 22	Sep 23	123 days	4,215 ft
Red Lodge	Jun 3	Sep 19	106 days	5,646 ft
Redstone	May 28	Sep 7	101 days	2,106 ft
Ridgeway 1 S	May 17	Sep 22	127 days	3,316 ft
Rock Springs	May 15	Sep 25	132 days	3,024 ft
Rogers Pass 9 NNE	May 21	Sep 15	115 days	4,200 ft
Roundup	May 20	Sep 21	124 days	3,200 ft
Roundup 15 SW	May 22	Sep 15	114 days	3,386 ft
Roy 8 NE	May 14	Sep 24	134 days	3,085 ft
Rudyard 19s	May 23	Sep 19	119 days	2,878 ft
Rudyard 21 N	May 30	Sep 11	103 days	3,000 ft
Ryegate	May 17	Sep 23	127 days	3,650 ft
Ryegate 18 NNW	May 26	Sep 18	112 days	4,440 ft
Saco 1 NNW	May 15	Sep 23	130 days	2,185 ft
Saint Ignatius	May 12	Oct 2	142 days	2,915 ft
Saint Regis 1 NE	any month	any month	101 days	2,660 ft
Sand Creek	May 12	Sep 27	136 days	2,910 ft
Savage	May 12	Sep 25	135 days	1,978 ft
Scobey 4 NW	May 28	Sep 6	99 days	2,390 ft
Seeley Lake Ranger Station	any month	any month	74 days	4,100 ft
Shelby	May 23	Sep 16	115 days	3,325 ft
Shonkin 7 S	May 24	Sep 21	119 days	4,300 ft
Sidney	May 11	Sep 27	137 days	1,933 ft
Silver Gate	any month	any month	31 days	7,495 ft
Simpson 6 N - Wildhorse	May 26	Sep 15	110 days	2,815 ft
Skq Dam	May 15	Sep 28	134 days	2,730 ft
Sonnette 7 SW	May 25	Sep 19	115 days	3,914 ft
St. Marie	May 13	Sep 27	134 days	2,756 ft
St. Mary	Jun 12	Sep 5	82 days	4,560 ft
St. Mary 1 SSW	Jun 3	Sep 8	94 days	4,555 ft
Stanford	May 25	Sep 21	118 days	4,860 ft
Stevensville	May 22	Sep 19	115 days	3,375 ft
Sula 14 NE	any month	any month	39 days	5,155 ft
Sula 3 ENE	any month	any month	59 days	4,475 ft
Sun River 4 S	Jun 2	Sep 10	96 days	3,600 ft
Sunburst 8 E	May 17	Sep 25	129 days	3,700 ft
Superior	May 17	Sep 23	125 days	2,710 ft
Swan Lake	May 17	Sep 19	121 days	3,100 ft
Sweetgrass	May 15	Sep 25	132 days	3,510 ft
Terry	May 12	Sep 28	137 days	2,250 ft
Terry 21 NNW	May 26	Sep 17	113 days	3,142 ft
Thompson Falls Ph	May 7	Oct 4	150 days	2,380 ft
Tiber Dam	May 16	Sep 23	129 days	2,850 ft
Tizer Gardens	Jun 18	Sep 5	81 days	4,672 ft
Townsend 3se	May 19	Sep 19	122 days	3,964 ft
Trident	May 9	Sep 27	139 days	4,036 ft
Trout Creek Ranger Station	May 20	Sep 21	122 days	2,356 ft
Troy	May 14	Sep 25	132 days	1,929 ft
Turner 11n	May 19	Sep 21	124 days	2,982 ft
Twin Bridges	Jun 8	Sep 2	82 days	4,625 ft
Valentine	May 18	Sep 21	124 days	2,905 ft
Valier	May 17	Sep 24	129 days	3,807 ft
Vida 6 NE	May 16	Sep 22	129 days	2,284 ft
Virginia City	Jun 4	Sep 18	106 days	5,773 ft
W Glacier	May 18	Sep 20	124 days	3,148 ft
W Yellowstone Gateway	any month	any month	33 days	6,679 ft
Westby	May 18	Sep 21	125 days	2,103 ft
Western Ag Rsch Center	May 23	Sep 21	118 days	3,608 ft
White Sulphur Springs #2	Jun 4	Sep 11	97 days	5,040 ft
Whitefish	May 16	Sep 25	129 days	3,100 ft
Wibaux 2 E	May 27	Sep 16	112 days	2,696 ft
Wilsall 1s	Jun 4	Sep 6	92 days	5,015 ft
Wilsall 8 ENE	Jun 8	Sep 7	89 days	5,865 ft
Winifred	May 16	Sep 23	127 days	3,243 ft
Wisdom	any month	any month	22 days	6,060 ft
Wise River 3 WNW	any month	any month	27 days	5,730 ft
Wolf Point	May 8	Sep 28	143 days	2,090 ft
Wolf Point 29 ENE	May 24	Sep 14	110 days	2,085 ft
Wolf Point 34 NE	May 13	Sep 28	137 days	2,643 ft
Wolf Point Intl Airport	May 16	Sep 20	125 days	1,986 ft
Wyola 1 SW	May 21	Sep 17	117 days	3,730 ft
Yaak 9nne	any month	any month	74 days	3,085 ft
Yellowtail Dam	May 7	Oct 5	151 days	3,305 ft
Zortman	May 18	Sep 23	126 days	4,035 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.