Spring Glen climate

Spring Glen Frost Dates and Growing Season

NOAA 1991-2020 normals for Price Carbon CO AP, 10.1 km from Spring Glen, elevation 5921 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Price Carbon CO AP. 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 May 3 and the first fall freeze around October 12, a growing season of about 160 days.

Median at 36°F
last May 18, first October 2
Median at 32°F
last May 3, first October 12
Median at 28°F
last April 22, first October 22

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°FJun 5May 29May 24May 21May 18May 15May 10May 6May 3
32°FMay 21May 15May 10May 6May 3May 1Apr 28Apr 25Apr 20
28°FMay 8May 3Apr 29Apr 25Apr 22Apr 19Apr 16Apr 13Apr 8
24°FApr 26Apr 20Apr 16Apr 13Apr 9Apr 6Apr 3Mar 28Mar 18
20°FApr 13Apr 5Mar 31Mar 26Mar 19Mar 14Mar 10Mar 7Mar 2
16°FMar 25Mar 12Mar 8Mar 5Mar 1Feb 27Feb 22Feb 18Feb 12

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°FSep 21Sep 25Sep 27Sep 30Oct 2Oct 4Oct 7Oct 11Oct 16
32°FSep 29Oct 3Oct 6Oct 9Oct 12Oct 15Oct 17Oct 20Oct 25
28°FOct 8Oct 12Oct 16Oct 19Oct 22Oct 25Oct 29Nov 1Nov 5
24°FOct 19Oct 23Oct 26Oct 29Nov 1Nov 4Nov 7Nov 11Nov 15
20°FOct 26Nov 2Nov 6Nov 9Nov 12Nov 15Nov 18Nov 20Nov 24
16°FNov 7Nov 12Nov 16Nov 18Nov 20Nov 23Nov 26Nov 30Dec 6

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°F156151145141136131126122114
32°F178172168165160156152146138
28°F200192188185180177172167161
24°F228220214209204200195189182
20°F256248242237232227220214205
16°F285278272266261256250244234

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
6,379
Cooling degree days, base 65°F
744
Growing degree days, base 40°F
4,887
Growing degree days, base 45°F
3,774
Growing degree days, base 50°F
2,814
Growing degree days, base 55°F
2,001
Growing degree days, base 60°F
1,313

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,22400
February93900
March747011
April524054
May25420257
June54133530
July1308772
August6227687
September10654403
October461198
November85702
December1,20600

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 10.1 km from Spring Glen. 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 USW00093141 (Price Carbon CO AP). Public domain.