Frost Dates for Granby, CO

Based on data from Grand Lake 6 Ssw weather station, 8 miles away

Elevation: 7966 ft

Frost Dates

Last Spring Frost (50%) June 13

First Fall Frost (50%) September 7

30% Probability

Last Spring Frost June 19

First Fall Frost September 2

Hard Freeze (28°F)

Last Spring Hard Freeze May 26

First Fall Hard Freeze September 22

40.09°N, 105.94°W © OpenStreetMap

Growing Season

86 Days June 13 to September 7

USDA Hardiness Zone

Zone 4a

Avg. annual minimum: −30 to −25°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°

14°

Jan

18°

Feb

27°

Mar

36°

Apr

45°

May

54°

Jun

60°

Jul

58°

Aug

51°

Sep

41°

Oct

29°

Nov

18°

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°	14°	3°
February	31°	18°	5°
March	40°	27°	13°
April	48°	36°	23°
May	59°	45°	31°
June	70°	54°	38°
July	75°	60°	44°
August	73°	58°	43°
September	67°	51°	36°
October	55°	41°	27°
November	40°	29°	18°
December	28°	18°	8°

Precipitation

0" 1" 2" 2.4"

1.6"

Jan

1.4"

Feb

1.6"

Mar

1.9"

Apr

2.0"

May

2.2"

Jun

2.4"

Jul

2.0"

Aug

1.8"

Sep

2.0"

Oct

1.5"

Nov

1.6"

Dec

Precipitation table

Average monthly precipitation (inches)
Month	Precipitation
January	1.6
February	1.4
March	1.6
April	1.9
May	2.0
June	2.2
July	2.4
August	2.0
September	1.8
October	2.0
November	1.5
December	1.6

Sunrise / Sunset

Jan: 7:30 AM – 4:56 PM · 9h 26m

Feb: 7:04 AM – 5:32 PM · 10h 28m

Mar: 7:23 AM – 7:04 PM · 11h 41m

Apr: 6:32 AM – 7:36 PM · 13h 04m

May: 5:53 AM – 8:07 PM · 14h 14m

Jun: 5:38 AM – 8:29 PM · 14h 51m

Jul: 5:51 AM – 8:27 PM · 14h 36m

Aug: 6:20 AM – 7:55 PM · 13h 36m

Sep: 6:50 AM – 7:05 PM · 12h 15m

Oct: 7:21 AM – 6:16 PM · 10h 54m

Nov: 6:57 AM – 4:40 PM · 9h 44m

Dec: 7:25 AM – 4:34 PM · 9h 09m

Daylight Mountain Time (MT) Longest: 14h 52m · Shortest: 9h 08m

Sunrise and sunset table

Sunrise, sunset, and daylight on the 15th of each month (Mountain Time (MT))
Month	Sunrise	Sunset	Daylight
January	7:30 AM	4:56 PM	9h 26m
February	7:04 AM	5:32 PM	10h 28m
March	7:23 AM	7:04 PM	11h 41m
April	6:32 AM	7:36 PM	13h 04m
May	5:53 AM	8:07 PM	14h 14m
June	5:38 AM	8:29 PM	14h 51m
July	5:51 AM	8:27 PM	14h 36m
August	6:20 AM	7:55 PM	13h 36m
September	6:50 AM	7:05 PM	12h 15m
October	7:21 AM	6:16 PM	10h 54m
November	6:57 AM	4:40 PM	9h 44m
December	7:25 AM	4:34 PM	9h 09m

Nearby Stations

Grand Lake 1 Nw, CO Fraser, CO Allenspark 3nw, CO June 14 - September 12 Boulder 14 W, CO June 21 - September 2 Williams Fork Dam, CO June 12 - September 10 Estes Park 3 Sse, CO May 30 - September 17

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