National Weather Service United States Department of Commerce

Severe Weather for Portions of Montana and Plains; Great Plains into Midwest Warm Up

Scattered severe thunderstorms are expected in Montana and the Plains today. Heavy rain may cause localized flash flooding in the northern Plains into the upper Midwest and lower Mississippi Valley. Critical fire weather conditions will persist across the Great Basin and interior Alaska into early week. Heat will build for the Plains, Ohio and Tennessee Valleys and Great Lakes into Monday. Read More >

Western and Central Wyoming

Weather Forecast Office

Fall First Freeze Information

Weather.gov > Western and Central Wyoming > Fall First Freeze Information
Fall First Freeze Information
Current Freeze Watches  Quick Jumps Current Freeze Warnings
MRCC's First Freeze Graphics  Climatological First Freeze Graphics  7 Day Minimum Temperature Forecast Freeze Data for Specific Cities  Growing Season Data for Specific Cities
 
Click on Images to Enlarge

 

Midwestern Regional Climate Center Graphics
 
Greatest Consecutive Hours <= 32°F: Last 7 Days
 

Midwestern Regional Climate Center Graphics

First Freeze Data:
32° F
 
Dates of First 32°F Freeze: Wyoming
Days since Most Recent 32°F Freeze
Date of Most Recent 32°F Freeze
Over past 14 days
Number of Days <= 32°F
Growing Degree Days (base 42°F) Since Most Recent 32°F Freeze

Midwestern Regional Climate Center Graphics

First Hard Freeze Data:
28° F
 
Dates of First 28°F Freeze: Wyoming
Days since Most Recent 28°F Freeze
Date of Most Recent 28°F Freeze
Over past 14 days
Number of Days <= 28°F
Growing Degree Days (base 42°F) Since Most Recent 28°F Freeze
Climatological First Freeze Graphics
Date of Median First 32° F Freeze
Date of Early First 32° F Freeze
Date of Late First 32° F Freeze
 
 
Date of Median First 28° F Freeze
Date of Early First 28° F Freeze
Date of Late First 28° F Freeze
7 Day Minimum Temperature Forecast
Tonight's Lows
Tomorrow Night's Lows
Night 3 Lows
 
Tonight's Lows - Click to Enlarge
 
Tomorrow Night's Lows - Click to Enlarge
Night 3 Lows - Click to Enlarge
Night 4 Lows
Night 5 Lows
Night 6 Lows
Night 4 Lows - Click to Enlarge
Night 5 Lows - Click to Enlarge
Night 6 Lows - Click to Enlarge
Night 7 Lows
6 - 10 Day Outlook
8 - 14 Day Outlook
Night 7 Lows - Click to Enlarge
6 - 10 Day Outlook - Click to Enlarge
8 - 14 Day Outlook - Click to Enlarge

More Information
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Climatological First Freeze Data

Location

County

Elev.
(ft)

  

Early

Average

Late

  

2021
 33F-36F

2021
29F-32F

2021
<=28F

  

2020
<=32F

2019
<=32F

2018
<=32F

2018
<=32F
Clark 3NE
(1961-2021)		 Park 4090   AUG 23
(2015)		 SEP 17 OCT 15
(1963)		   SEP  17 21 SEP 21 SEP   9 SEP 30 SEP 25 SEP 17 SEP
Cody Airport
(1915-2021)		 Park 5100   AUG 21
(1945)		 SEP 22 NOV 1
(1940)		   21 SEP 11 OCT 11 OCT   7 SEP 29 SEP 29 SEP 22 SEP
(1916-2021)
 Big Horn 4105   AUG 26
(1992)		 SEP 19 OCT 17
(2015)		   18 SEP 30 SEP 2 NOV   10 SEP 3 OCT 2 OCT 4 OCT
(1999-2021)
 Big Horn 3935  

SEP 9
(2020)

 SEP 30 OCT 18
(2011)		   21 SEP 21 SEP 14 OCT   9 SEP 3 OCT 26 SEP 4 OCT
Thermopolis
(1899-2021)
 Hot Springs 4315   AUG 15
(1938)		 SEP 22 OCT 19
(2007)		   21 SEP 30 SEP 15 OCT   8 SEP 3 OCT 26 SEP 3 OCT
Worland Airport
(1960-2021)
 Washakie 4245   SEP 2
(1974)		 SEP 28 OCT 18
(1989)		   21 SEP 21 SEP 30 SEP   8 SEP 2 OCT 21 SEP 20 SEP
Buffalo
(1899-2020)
 Johnson 4670   AUG 15
(2012)		 SEP 19 OCT 17
(1963)		   M M M   8 SEP 1 OCT 28 SEP 3 OCT
Buffalo Airport
(1999-2021)
 Johnson 4970   SEP 8
(2020)		 SEP 30 OCT 19
(2011)		   21 SEP 11 OCT 12 OCT   8 SEP 1 OCT 28 SEP 3 OCT
Kaycee
(1949-2021)
 Johnson 4975   AUG 20
(1964)		 SEP 16 OCT 16
(2015)		   21 SEP 22 SEP 12 OCT   8 SEP 2 OCT 26 SEP 26 SEP
Moose
(1958-2021)
 Teton 6470   AUG 1
(1995)		 AUG 22 SEP 23
(1998)		   10 AUG 29 AUG 17 SEP   8 SEP 13 SEP 29 AUG 17 SEP
Dubois
(1907-2021)
 Fremont 6955   AUG 1
(1927)		 AUG 26 SEP 21
(1990)		   29 AUG

4 SEP

 21 SEP   8 SEP 18 SEP 1 SEP 17 SEP
Riverton
(1907-2021)
 Fremont 4950   AUG 7
(1912)		 SEP 17 OCT 12
(2015)		   18 SEP 21 SEP 30 SEP   8 SEP 3 OCT 25 SEP 26 SEP
Lander (town)
(1999-2020)
 Fremont 5320   AUG 31
(2005)		 SEP 15 SEP 20
(2017)		   M M M   7 SEP 2 OCT 21 SEP 20 SEP
Lander Hunt Field
(1891-2021)
 Fremont 5585   AUG 22
(1904)		 SEP 25 OCT 25
(2010)		   20 SEP 21 SEP 30 SEP   7 SEP 2 OCT 26 SEP 1 OCT
Jeffrey City
(1964-2021)
 Fremont 6320   AUG 10
(2014)		 SEP 10 OCT 5
(2001)		   17 SEP 21 SEP 21 SEP   31 AUG 18 SEP 29 SEP 17 SEP
Casper Airport
(1939-2021)
 Natrona 5320   AUG 23
(2015)		 SEP 20 OCT 28
(1940)		   17 SEP 17 SEP 12 OCT   7 SEP 2 OCT 21 SEP 27 SEP

Location

County

Elev.
(ft)

  

Early    

Average

Late 

 

2021
33F-36F

2021
29F-32F

2021
<=28F

  

2020
<=32F

2019
<=32F

2018
<=32F

2017
<=32F
Afton
(1957-2021)
 Lincoln 6245   AUG 2
(1975)		 AUG 25 SEP 24
(1963)		   10 AUG 4 SEP 21 SEP   31 AUG 27 AUG 29 AUG 17 SEP
Bedford 3 SE
(1975-2021)
 Lincoln 6425   AUG 1
(2000)		 AUG 27 OCT 2
(1990)		   21 AUG 29 AUG 21 SEP   1 SEP 18 SEP 4 SEP 22 AUG
Sublette 6940   AUG 1
(1995)		 AUG 21 SEP 19
(2013)		   10 AUG 10 AUG 4 SEP   30 AUG 17 AUG 24 AUG 19 AUG
Big Piney Airport
(1998-2021)
 Sublette 6975   AUG 4
(2016)		 AUG 24 SEP 19
(2013)		   10 AUG 10 AUG 4 SEP   31 AUG 13 AUG 28 AUG 22 AUG
Fossil Butte
(1990-2021)
 Lincoln 6780   AUG 1
(1995)		 AUG 24 SEP 19
(2013)		   10 AUG 27 AUG 4 SEP   16 AUG 13 AUG 26 AUG 16 SEP
Green River
(1905-2021)
 Sweetwater 6130   AUG 4
(1980)		 SEP 11 OCT 23
(2015)		   21 SEP 21 SEP 13 OCT   8 SEP 1 OCT 25 SEP 17 SEP
Rock Springs Apt.
(1948-2021)
 Sweetwater 6760   SEP 1
(1973)		 SEP 21 OCT 24
(1963)		   20 SEP 21 SEP 12 OCT   7 SEP 18 SEP 25 SEP 17 SEP
*Month Day* = record earliest freeze    *Month Day* = Record latest freeze

*** Data Updated on November 21, 2021 ***
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td>
Growing Season Data
Location County Elev. (ft) Longest Growing Season
Average Growing Season (Days)
Shortest Growing Season 2021   2020 2019 2018 2017

Clark 3 NE
(1961-2021)

 Park 4090
150 (2013)
116
71 (1976)
 113  
123
 112
104
112
Deaver
(1916-2021)
 Big Horn 4105
165 (2017, 2018)
124
86 (1992)
 157  
123
 151
165
165
Thermopolis
(1899-2021)
 Hot Springs 4315
181 (2007)
128

65 (1938)

 143  
139
 152
147
156
Worland
(1960-2021)
 Washakie 4245
176 (1989)
140
102 (1974 )
 132  
122
 144
126
142
Buffalo
(1899-2020)
 Johnson 4670
156 (1998)
120
57 (1904)
 M  
120
 113
144
121
Kaycee
(1949-2021)
 Johnson 4975
147 (2015)
113
56 (1904)
 131   105 130
82
126
Moose
(1958-2021)
 Teton 6470
104 (1961)
51
0 (1995)
 77  
89
 82
64
78
Dubois
(1907-2021)
 Fremont 6955
111 (2017) 
61
0 (1995)
 83  
80
 87
80 
111
Riverton
(1907-2021)
 Fremont 4950
159 (1998)
119
67 (1989)
 134  
106
 133
150
130
Lander (town)
(1999-2020)
 Fremont 5320
139 (2018)
102
81 (2000, 2005)
 M  
118
 114
139
119
Lander Apt.
(1891-2021)
 Fremont 5585
170 (1987)
122
57 (1904)
 118  
114
 136
133
145
Jeffrey City
(1964-2021)
 Fremont 6320
130 (2021)
 101
53 (1985, 1993)
 130  
96
 99
105
116
Casper Apt.
(1939-2021)
 Natrona 5320
165 (1963)
121
78 (1972)
 112  
80
 113
141
129
Location County Elev. (ft) Longest Growing Season
Average Growing Season (Days)
Shortest Growing Season 2021   2020 2019 2018 2017
Afton
(1957-2021)
 Lincoln 6245  111 (2017) 56 8 (2015) 83   82 65 77 111
Bedford 3 SE
(1975-2021)
 Lincoln 6425
109 (1990)
63
5(2000)
 77  
82
 86
82
84
Boulder Rearing Station
(1989-2021)
 Sublette 6940
86 (2013)
53
19 (2016)
 58  
72
 52
71
48 
Big Piney
(1998-2021)
 Sublette 6975
87 (2013)
58
2 (1987)
 58  
46
 48
57
 52
Fossil Butte
(1990-2021)
 Lincoln 6780
89 (2013)
50
0 (1995)
 74  
31
 44
55
77
Green River
(1905-2021)
 Sweetwater 6130
149 (2015)
100
45 (1968)
 131  
106
 112
145
119
Rock Springs Apt.
(1948-2021)
 Sweetwater 6760
155 (1963)
116
73 (1973)

131

  
105
 100
145
95

Jeffrey City (2021) = New record set in 2021.  M = missing data during the period.
Growing Season = Number of Days between last Spring Freeze and first Fall freeze (<= 32°F)

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