Kremmling climate

Kremmling Frost Dates and Growing Season

NOAA 1991-2020 normals for Kremmling, 1.8 km from Kremmling, elevation 7460 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Kremmling. A median date has an even chance of a later freeze in spring, or an earlier one in fall.

The last spring freeze typically comes around June 14 and the first fall freeze around September 5, a growing season of about 80 days.

Median at 32°F
last June 14, first September 5
Median at 28°F
last May 28, first September 16

Last freeze in spring

The chance of a later freeze than the date shown. At 10 percent, one spring in ten still freezes after the date; planting after the 10 percent date for 32°F is the cautious choice.

Threshold10%20%30%40%50%60%70%80%90%
36°F–––––––––
32°FJun 30Jun 24Jun 21Jun 17Jun 14Jun 11Jun 8Jun 5Jun 1
28°FJun 11Jun 6Jun 2May 31May 28May 24May 21May 18May 13
24°FMay 28May 22May 18May 15May 11May 8May 6May 3Apr 30
20°FMay 15May 9May 6May 3May 1Apr 29Apr 25Apr 21Apr 16
16°FMay 4Apr 29Apr 24Apr 20Apr 16Apr 13Apr 9Apr 6Apr 2

First freeze in fall

The chance of an earlier freeze than the date shown. At 10 percent, one fall in ten freezes before the date.

Threshold10%20%30%40%50%60%70%80%90%
36°F–––––––––
32°FAug 26Aug 30Sep 1Sep 3Sep 5Sep 8Sep 10Sep 13Sep 16
28°FSep 4Sep 9Sep 11Sep 14Sep 16Sep 18Sep 20Sep 23Sep 27
24°FSep 15Sep 18Sep 22Sep 24Sep 27Sep 29Oct 1Oct 4Oct 8
20°FSep 23Sep 29Oct 2Oct 5Oct 7Oct 10Oct 13Oct 17Oct 21
16°FOct 2Oct 7Oct 12Oct 15Oct 18Oct 21Oct 23Oct 27Nov 1

Growing season length

Days between the last spring and first fall freeze at each threshold, with the chance of a season at least that long.

Threshold10%20%30%40%50%60%70%80%90%
36°F696357534944393327
32°F999388858077736960
28°F1281211171131101061029791
24°F153147143139135132129124117
20°F178171166162158154150145139
16°F203196190187182177173167159

How often it gets that cold

The share of years with at least one night at or below each temperature.

36°F or colder
100% of years
32°F or colder
100% of years
28°F or colder
100% of years
24°F or colder
100% of years
20°F or colder
100% of years
16°F or colder
100% of years

Degree days

A degree day is one degree of the daily mean temperature beyond a base, for one day. Heating degree days count cold (the fuel a house burns), cooling degree days heat, growing degree days the warmth a crop needs; each crop has its own base.

Heating degree days, base 65°F
9,665
Cooling degree days, base 65°F
35
Growing degree days, base 40°F
2,689
Growing degree days, base 45°F
1,833
Growing degree days, base 50°F
1,130
Growing degree days, base 55°F
580
Growing degree days, base 60°F
204

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,62900
February1,33800
March1,09600
April79103
May541049
June2463219
July9323396
August1439333
September3680123
October75207
November1,11300
December1,55600

What this means

NOAA computes these from the daily lows at the station over 1991-2020, fitting the dates of each year's last and first freeze to a distribution, so a date can be stated at any level of risk. 36°F is a frost risk for tender plants on a clear, calm night, since the ground cools below the air above it; 32°F is a freeze; 28°F is a hard freeze that kills most annuals.

The station is 1.8 km from Kremmling. Low ground, valleys and open fields freeze earlier and later than a town center or a hillside.

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Sources

NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal normals for station USC00054664 (Kremmling). Public domain.