Pine Haven climate

Pine Haven Frost Dates and Growing Season

NOAA 1991-2020 normals for Devils Twr #2, 26.2 km from Pine Haven, elevation 3862 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Devils Twr #2. 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 23 and the first fall freeze around September 20, a growing season of about 118 days.

Median at 36°F
last June 4, first September 8
Median at 32°F
last May 23, first September 20
Median at 28°F
last May 12, first October 1

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 23Jun 17Jun 12Jun 8Jun 4Jun 1May 29May 26May 22
32°FJun 6May 31May 28May 26May 23May 21May 19May 16May 12
28°FMay 24May 20May 17May 14May 12May 10May 7May 4May 2
24°FMay 13May 10May 7May 4May 2Apr 30Apr 27Apr 24Apr 19
20°FMay 3Apr 30Apr 28Apr 24Apr 21Apr 18Apr 14Apr 11Apr 5
16°FApr 26Apr 21Apr 16Apr 12Apr 9Apr 5Apr 2Mar 30Mar 22

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°FAug 27Sep 1Sep 3Sep 6Sep 8Sep 12Sep 15Sep 19Sep 23
32°FSep 4Sep 9Sep 14Sep 17Sep 20Sep 23Sep 27Sep 30Oct 4
28°FSep 15Sep 21Sep 25Sep 29Oct 1Oct 3Oct 6Oct 9Oct 14
24°FSep 27Oct 1Oct 4Oct 7Oct 11Oct 14Oct 17Oct 20Oct 24
20°FOct 4Oct 10Oct 15Oct 18Oct 21Oct 24Oct 26Oct 29Nov 2
16°FOct 15Oct 20Oct 23Oct 26Oct 29Oct 31Nov 3Nov 7Nov 12

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°F114108103999591867972
32°F13713012612211811310810395
28°F158151147144141137132127120
24°F180174169165162157153147140
20°F204197192187183179174168161
16°F228220214209205200196190182

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
7,912
Cooling degree days, base 65°F
439
Growing degree days, base 40°F
3,937
Growing degree days, base 45°F
2,956
Growing degree days, base 50°F
2,120
Growing degree days, base 55°F
1,422
Growing degree days, base 60°F
860

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,36400
February1,15200
March95808
April668035
May3978156
June13358381
July28183620
August46155574
September23334283
October623260
November98903
December1,32200

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 26.2 km from Pine Haven. 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 USC00482466 (Devils Twr #2). Public domain.