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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

 

2018
 33F-36F

2018
29F-32F

2018
<=28F

 

2017
<=32F

2016
<=32F

2015
<=32F

2014
<=32F

Clark 3NE
(1961-2018)
Park 4090   AUG 23
(2015)
SEP 17 OCT 15
(1963)
   SEP 21  SEP 25  SEP 26   SEP 17 OCT 5 AUG 23 SEP 12
Cody Airport
(1915-2018)
Park 5100   AUG 21
(1945)
SEP 22 NOV 1
(1940)
   SEP 25  SEP 25  OCT 8   SEP 22 OCT 5 OCT 28 SEP 11
(1916-2018)
Big Horn 4105   AUG 26
(1992)
SEP 19 OCT 17
(2015)
   SEP 22  OCT 2  OCT 12   OCT 4 OCT 11 OCT 17 SEP 12
(1999-2018)
Big Horn 3935   SEP 12
(2014)
OCT 1 OCT 18
(2011)
   SEP 25  SEP 26  OCT 11   OCT 4 OCT 11 OCT 16 SEP 12
Thermopolis
(1899-2018)
Hot Springs 4315   AUG 15
(1938)
SEP 22 OCT 19
(2007)
   SEP 21  SEP 29  OCT 12   OCT 3 OCT 7 OCT 16 SEP 12
Worland Airport
(1960-2018)
Washakie 4245   SEP 2
(1974)
SEP 28 OCT 18
(1989)
   SEP 21  SEP 21  SEP 26   SEP 20 OCT 6 OCT 12 SEP 12
Buffalo
(1899-2018)
Johnson 4670   AUG 15
(2012)
SEP 19 OCT 17
(1963)
   SEP 25  SEP 25  OCT 6   SEP 20 OCT 5 OCT 12 SEP 11
Buffalo Airport
(1999-2018)
Johnson 4970   SEP 10
(2014)
OCT 1 OCT 19
(2011)
   SEP 25  SEP 28  OCT 11   OCT 3 OCT 5 OCT 16 SEP 10
Kaycee
(1949-2018)
Johnson 4975   AUG 20
(1964)
SEP 16 OCT 16
(2015)
   SEP 25  SEP 26  OCT 12   SEP 26 OCT 12 OCT 16 SEP 11
Moose
(1958-2018)
Teton 6470   AUG 1
(1995)
AUG 21 SEP 23
(1998)
   AUG 24  AUG 29  SEP 21   SEP 17 AUG 3 AUG 23 AUG 2
Dubois
(1907-2018)
Fremont 6955   AUG 1
(1927)
AUG 26 SEP 21
(1990)
   AUG 31

 SEP 1

 SEP 21   SEP 17 AUG 24 AUG 23 SEP 4
Riverton
(1907-2018)
Fremont 4950   AUG 7
(1912)
SEP 16 OCT 12
(2015)
   SEP 21  SEP 25  SEP 26   SEP 26 OCT 5 OCT 12 SEP 12
Lander (town)
(1999-2018)
Fremont 5320   AUG 31
(2005)
SEP 15 SEP 20
(2017)
   SEP 21  SEP 21  SEP 25   SEP 20 SEP 10 SEP 18 SEP 13
Lander Hunt Field
(1891-2018)
Fremont 5585   AUG 22
(1904)
SEP 21 OCT 25
(2010)
   SEP 25  SEP 26  OCT 11   OCT 1 OCT 5 OCT 22 SEP 12
Jeffrey City
(1964-2018)
Fremont 6320   AUG 10
(2014)
SEP 10 OCT 5
(2001)
   AUG 29  AUG 29  SEP 21   SEP 17 SEP 10 AUG 23 AUG 10
Casper Airport
(1939-2018)
Natrona 5320   AUG 23
(2015)
SEP 21 OCT 28
(1940)
   SEP 21  SEP 21  SEP 25   SEP 27 SEP 10 AUG 23 SEP 12

Location

County

Elev.
(ft)

 

Early    

Average

Late 

 

2018
33F-36F

2018
29F-32F

2018
<=28F

 

2017
<=32F

2016
<=32F

2015
<=32F

2014
<=32F

Afton
(1957-2018)
Lincoln 6245   AUG 2
(1975)
AUG 24 SEP 24
(1963)
   AUG 29  AUG 29  SEP 21   SEP 17 AUG 24 AUG 6 SEP 4
Bedford 3 SE
(1975-2018)
Lincoln 6425   AUG 1
(2000)
AUG 26 OCT 2
(1990)
   AUG 7  SEP 4  SEP 21   AUG 22 AUG 4 AUG 23 SEP 4
Sublette 6940   AUG 1
(1995)
AUG 21 SEP 19
(2013)
   AUG 6  AUG 24  AUG 29   AUG 19 AUG 4 AUG 21 SEP 1
Big Piney Airport
(1998-2018)
Sublette 6975   AUG 4
(2016)
AUG 25 SEP 19
(2013)
   AUG 6  AUG 28  AUG 29   AUG 16 AUG 4 AUG 23 SEP 1
Fossil Butte
(1990-2018)
Lincoln 6780   AUG 1
(1995)
AUG 25 SEP 19
(2013)
   AUG 6  AUG 26  AUG 29   SEP 16 AUG 4 AUG 20 SEP 1
Green River
(1905-2018)
Sweetwater 6130   AUG 4
(1980)
SEP 10 OCT 23
(2015)
   SEP 21  SEP 25  OCT 11   SEP 17 OCT 6 OCT 23 SEP 12
Rock Springs Apt.
(1948-2018)
Sweetwater 6760   SEP 1
(1973)
SEP 22 OCT 24
(1963)
   SEP 25  SEP 25  OCT 8   SEP 17 OCT 3 OCT 22 SEP 11
*Month Day* = record earliest freeze    *Month Day* = Record latest freeze

*** Final Update on October 12, 2018 ***

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Growing Season Data
Location County Elev. (ft) Longest Growing Season
Average Growing Season (Days)
Shortest Growing Season 2018   2017 2016 2015 2014

Clark 3 NE
(1961-2018)

Park 4090
150 (2013)
116
71 (1976)
104  
112
145
103
120

 

Deaver
(1916-2018)
Big Horn 4105
165 (2017, 2018)
123
86 (1992)
165  
165
150
157
120
Thermopolis
(1899-2018)
Hot Springs 4315
181 (2007)
128

65 (1938)

147  
156
148
157
121
Worland
(1960-2018)
Washakie 4245
176 (1989)
140
102 (1974 )
146  
142
135
153
120
Buffalo
(1899-2018)
Johnson 4670
156 (1998)
119
57 (1904)
144  
121
138
146
117
Kaycee
(1949-2018)
Johnson 4975
147 (2015)
113
78 (1964)
137   126 146
147
119
Moose
(1958-2018)
Teton 6470
104 (1961)
50
0 (1995)
64  
78
21
24
43
Dubois
(1907-2018)
Fremont 6955
111 (2017)
58 
0 (1995)
80  
111
83
23
77
Riverton
(1907-2018)
Fremont 4950
159 (1998)
118
67 (1989)
150  
130
145
153
120
Lander (town)
(1999-2018)
Fremont 5320
139 (2018)
102
81 (2000, 2005)
139  
119
108
124
85
Lander Apt.
(1891-2018)
Fremont 5585
170 (1987)
122
57 (1904)
136  
133
145
155
106
Jeffrey City
(1964-2018)
Fremont 6320
127 (2009)
99
53 (1985, 1993)
105  
116
113
88
55
Casper Apt.
(1939-2018)
Natrona 5320
165 (1963)
121
78 (1972)
141  
129
100
94
119
Location County Elev. (ft) Longest Growing Season
Average Growing Season (Days)
Shortest Growing Season 2018   2017 2016 2015 2014
Afton
(1957-2018)
Lincoln 6245  111 (2017) 54 8 (2015) 77    111 57 8 76
Bedford 3 SE
(1975-2018)
Lincoln 6425
109 (1990)
61
8 (1995)
82  
84
38
24
76
Boulder Rearing Station
(1989-2018)
Sublette 6940
86 (2013)
52
19 (2016)
71  
48
19
21
60
Big Piney
(1998-2018)
Sublette 6975
87 (2013)
59
2 (1987)
57  
52
20
24
61
Fossil Butte
(1990-2018)
Lincoln 6780
89 (2013)
50
0 (1995)
55  
77
21
20
61
Green River
(1905-2018)
Sweetwater 6130
149 (2015)
99
45 (1968)
145  
119
145
149
117
Rock Springs Apt.
(1948-2018)
Sweetwater 6760
155 (1963)
116
73 (1973)

145

 
95
132
150
119

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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