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Fall First Freeze Information
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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

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Climatological First Freeze Data

Location

County

Elev.
(ft)

 

Early

Average

Late

 

2020
 33F-36F

2020
29F-32F

2020
<=28F

 

2019
<=32F

2018
<=32F

2017
<=32F

2016
<=32F

Clark 3NE
(1961-2018)
Park 4090   AUG 23
(2015)
SEP 17 OCT 15
(1963)
  SEP 1 SEP 9 SEP 9   SEP 30 SEP 25 SEP 17 OCT 5
Cody Airport
(1915-2018)
Park 5100   AUG 21
(1945)
SEP 22 NOV 1
(1940)
  SEP 7 SEP 7 SEP 9   SEP 29 SEP 29 SEP 22 OCT 11
(1916-2018)
Big Horn 4105   AUG 26
(1992)
SEP 19 OCT 17
(2015)
  SEP 10 SEP 10 OCT 16   OCT 3 OCT 2 OCT 4 OCT 11
(1999-2018)
Big Horn 3935  

SEP 9
(2020)

SEP 30 OCT 18
(2011)
  SEP 8 SEP 9 OCT 16   OCT 3 SEP 26 OCT 4 OCT 11
Thermopolis
(1899-2018)
Hot Springs 4315   AUG 15
(1938)
SEP 22 OCT 19
(2007)
  SEP 8 SEP 8 OCT 15   OCT 3 SEP 26 OCT 3 OCT 7
Worland Airport
(1960-2018)
Washakie 4245   SEP 2
(1974)
SEP 28 OCT 18
(1989)
  SEP 7 SEP 8 SEP 9   OCT 2 SEP 21 SEP 20 OCT 6
Buffalo
(1899-2018)
Johnson 4670   AUG 15
(2012)
SEP 19 OCT 17
(1963)
  AUG 31 SEP 8 SEP 9   OCT 1 SEP 25 SEP 20 OCT 5
Buffalo Airport
(1999-2018)
Johnson 4970   SEP 8
(2020)
SEP 30 OCT 19
(2011)
  SEP 7 SEP 8 SEP 9   OCT 1 SEP 28 OCT 3 OCT 5
Kaycee
(1949-2018)
Johnson 4975   AUG 20
(1964)
SEP 16 OCT 16
(2015)
  SEP 8 SEP 8 SEP 9   OCT 2 SEP 26 SEP 26 OCT 12
Moose
(1958-2018)
Teton 6470   AUG 1
(1995)
AUG 22 SEP 23
(1998)
  AUG 31 SEP 8 SEP 9   AUG 13 AUG 29 SEP 17 AUG 3
Dubois
(1907-2018)
Fremont 6955   AUG 1
(1927)
AUG 26 SEP 21
(1990)
  AUG 31

SEP 8

SEP 8   SEP 13 AUG 29 SEP 17 AUG 3
Riverton
(1907-2018)
Fremont 4950   AUG 7
(1912)
SEP 17 OCT 12
(2015)
  SEP 8 SEP 8 SEP 9   OCT 3 SEP 25 SEP 26 OCT 5
Lander (town)
(1999-2018)
Fremont 5320   AUG 31
(2005)
SEP 15 SEP 20
(2017)
  SEP 7 SEP 7 SEP 8   OCT 2 SEP 21 SEP 20 SEP 10
Lander Hunt Field
(1891-2018)
Fremont 5585   AUG 22
(1904)
SEP 25 OCT 25
(2010)
  SEP 7 SEP 7 SEP 8   OCT 2 SEP 26 OCT 1 OC 5
Jeffrey City
(1964-2018)
Fremont 6320   AUG 10
(2014)
SEP 10 OCT 5
(2001)
  AUG 31 AUG 31 N/A   SEP 18 SEP 29 SEP 17 SEP 10
Casper Airport
(1939-2018)
Natrona 5320   AUG 23
(2015)
SEP 20 OCT 28
(1940)
  AUG 31 SEP 7 SEP 9   OCT 2 SEP 21 SEP 27 SEP 10

Location

County

Elev.
(ft)

 

Early    

Average

Late 

 

2020
33F-36F

2020
29F-32F

2020
<=28F

 

2019
<=32F

2018
<=32F

2017
<=32F

2016
<=32F

Afton
(1957-2018)
Lincoln 6245   AUG 2
(1975)
AUG 25 SEP 24
(1963)
   AUG 29 AUG 31 SEP 9   AUG 27 AUG 29 SEP 17 AUG 24
Bedford 3 SE
(1975-2018)
Lincoln 6425   AUG 1
(2000)
AUG 27 OCT 2
(1990)
  AUG 31 SEP 1 SEP 9   SEP 18 SEP 4 AUG 22 AUG 4
Sublette 6940   AUG 1
(1995)
AUG 21 SEP 19
(2013)
  AUG 8 AUG 30 SEP 1   AUG 17 AUG 24 AUG 19 AUG 4
Big Piney Airport
(1998-2018)
Sublette 6975   AUG 4
(2016)
AUG 24 SEP 19
(2013)
  AUG 15 AUG 31 SEP 1   AUG 13 AUG 28 AUG 22 AUG 4
Fossil Butte
(1990-2018)
Lincoln 6780   AUG 1
(1995)
AUG 24 SEP 19
(2013)
  AUG 9 AUG 16 SEP 8   AUG 13 AUG 26 SEP 16 AUG 4
Green River
(1905-2018)
Sweetwater 6130   AUG 4
(1980)
SEP 11 OCT 23
(2015)
  SEP 8 SEP 8 SEP 8   OCT 1 SEP 25 SEP 17 OCT 6
Rock Springs Apt.
(1948-2018)
Sweetwater 6760   SEP 1
(1973)
SEP 21 OCT 24
(1963)
  SEP 7 SEP 7 SEP 8   SEP 18 SEP 25 SEP 17 OCT 3
*Month Day* = record earliest freeze    *Month Day* = Record latest freeze

*** Data Updated on February 8, 2021 ***

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td>
Growing Season Data
Location County Elev. (ft) Longest Growing Season
Average Growing Season (Days)
Shortest Growing Season 2020   2019 2018 2017 2016

Clark 3 NE
(1961-2018)

Park 4090
150 (2013)
116
71 (1976)
123  
112
104
112
145
Deaver
(1916-2018)
Big Horn 4105
165 (2017, 2018)
123
86 (1992)
123  
121 
165
165
150
Thermopolis
(1899-2018)
Hot Springs 4315
181 (2007)
128

65 (1938)

139  
152
147
156
148
Worland
(1960-2018)
Washakie 4245
176 (1989)
140
102 (1974 )
122  
144
146
142
135
Buffalo
(1899-2018)
Johnson 4670
156 (1998)
119
57 (1904)
120  
113
144
121
138
Kaycee
(1949-2018)
Johnson 4975
147 (2015)
113
56 (1904)
105   133 82
126
146
Moose
(1958-2018)
Teton 6470
104 (1961)
50
0 (1995)
89  
82
64
78
21
Dubois
(1907-2018)
Fremont 6955
111 (2017)
58 
0 (1995)
80  
87
80
111
83
Riverton
(1907-2018)
Fremont 4950
159 (1998)
118
67 (1989)
106  
133
150
130
145
Lander (town)
(1999-2018)
Fremont 5320
139 (2018)
102
81 (2000, 2005)
118  
114
136
133
145
Lander Apt.
(1891-2018)
Fremont 5585
170 (1987)
122
57 (1904)
118  
114
136
133
145
Jeffrey City
(1964-2018)
Fremont 6320
127 (2009)
99
53 (1985, 1993)
96  
99
105
116
113
Casper Apt.
(1939-2018)
Natrona 5320
165 (1963)
121
78 (1972)
80  
113
141
129
100
Location County Elev. (ft) Longest Growing Season
Average Growing Season (Days)
Shortest Growing Season 2020   2019 2018 2017 2016
Afton
(1957-2018)
Lincoln 6245  111 (2017) 54 8 (2015) 82   65 77 111 57
Bedford 3 SE
(1975-2018)
Lincoln 6425
109 (1990)
61
5(2000)
82  
86
82
84
38
Boulder Rearing Station
(1989-2018)
Sublette 6940
86 (2013)
52
19 (2016)
72  
52
71
48
19
Big Piney
(1998-2018)
Sublette 6975
87 (2013)
59
2 (1987)
46  
48
57
52
20
Fossil Butte
(1990-2018)
Lincoln 6780
89 (2013)
50
0 (1995)
31  
44
55
77
21
Green River
(1905-2018)
Sweetwater 6130
149 (2015)
99
45 (1968)
106  
112
145
119
145
Rock Springs Apt.
(1948-2018)
Sweetwater 6760
155 (1963)
116
73 (1973)

105

 
100
145
95
132

XX (2018) = New record set in 2018.  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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