Frost Dates for Afton, WY

Elevation: 1904 m

Frost Dates

Last Spring Frost (50%) June 20

First Fall Frost (50%) September 1

30% Probability

Last Spring Frost June 27

First Fall Frost August 27

Hard Freeze (28°F)

Last Spring Hard Freeze June 1

First Fall Hard Freeze September 13

42.73°N, 110.92°W © OpenStreetMap

Growing Season

73 Days June 20 to September 1

USDA Hardiness Zone

Zone 4b

Avg. annual minimum: −25 to −20°F

Learn more

Köppen Climate

Dfb Warm-Summer Continental

Warm summers and cold, snowy winters. A shorter growing season than hot-summer continental. Hardy vegetables, root crops, and cool-season greens do well. Season extension is valuable.

Köppen climate map

Temperature

0° 20° 40° 60° 80°

15°

Jan

19°

Feb

28°

Mar

38°

Apr

47°

May

55°

Jun

62°

Jul

61°

Aug

52°

Sep

41°

Oct

28°

Nov

17°

Dec

32°F

28°F

Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Temperature table

Average monthly temperatures (°F)
Month	Avg High	Avg Temp	Avg Low
January	26°	15°	5°
February	31°	19°	8°
March	40°	28°	17°
April	50°	38°	25°
May	60°	47°	33°
June	71°	55°	38°
July	80°	62°	44°
August	79°	61°	43°
September	69°	52°	34°
October	56°	41°	26°
November	39°	28°	16°
December	27°	17°	7°

Precipitation

0" 2" 4" 4.1"

2.2"

Jan

2.1"

Feb

3.1"

Mar

3.3"

Apr

4.1"

May

3.5"

Jun

2.8"

Jul

3.3"

Aug

3.6"

Sep

3.4"

Oct

2.8"

Nov

2.3"

Dec

Precipitation table

Average monthly precipitation (inches)
Month	Precipitation
January	2.2
February	2.1
March	3.1
April	3.3
May	4.1
June	3.5
July	2.8
August	3.3
September	3.6
October	3.4
November	2.8
December	2.3

Sunrise / Sunset

Jan: 7:24 AM – 4:36 PM · 9h 11m

Feb: 6:50 AM – 5:10 PM · 10h 19m

Mar: 6:10 AM – 5:50 PM · 11h 39m

Apr: 5:25 AM – 6:35 PM · 13h 10m

May: 4:47 AM – 7:13 PM · 14h 27m

Jun: 4:26 AM – 7:34 PM · 15h 08m

Jul: 4:35 AM – 7:25 PM · 14h 51m

Aug: 5:08 AM – 6:52 PM · 13h 45m

Sep: 5:52 AM – 6:08 PM · 12h 16m

Oct: 6:36 AM – 5:24 PM · 10h 48m

Nov: 7:15 AM – 4:45 PM · 9h 30m

Dec: 7:34 AM – 4:26 PM · 8h 52m

Daylight Longest: 15h 09m · Shortest: 8h 51m

Sunrise and sunset table

Sunrise, sunset, and daylight on the 15th of each month (local solar time)
Month	Sunrise	Sunset	Daylight
January	7:24 AM	4:36 PM	9h 11m
February	6:50 AM	5:10 PM	10h 19m
March	6:10 AM	5:50 PM	11h 39m
April	5:25 AM	6:35 PM	13h 10m
May	4:47 AM	7:13 PM	14h 27m
June	4:26 AM	7:34 PM	15h 08m
July	4:35 AM	7:25 PM	14h 51m
August	5:08 AM	6:52 PM	13h 45m
September	5:52 AM	6:08 PM	12h 16m
October	6:36 AM	5:24 PM	10h 48m
November	7:15 AM	4:45 PM	9h 30m
December	7:34 AM	4:26 PM	8h 52m

Nearby Stations

Bedford 3 Se, WY Soda Springs AP, ID Bern, IDJune 17 - September 3 Bondurant, WY Grace, IDMay 29 - September 17 Daniel Fish Hatchery, WY

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