La Pine climate

La Pine Frost Dates and Growing Season

NOAA 1991-2020 normals for Wickiup Dam, 14.8 km from La Pine, elevation 4358 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Wickiup Dam. 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 7 and the first fall freeze around September 18, a growing season of about 100 days.

Median at 32°F
last June 7, first September 18
Median at 28°F
last May 16, first October 3

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°FJul 2Jun 21Jun 16Jun 12Jun 7Jun 2May 29May 23May 16
28°FJun 13Jun 3May 28May 20May 16May 11May 7May 2Apr 28
24°FMay 23May 12May 6May 2Apr 29Apr 25Apr 18Apr 10Apr 2
20°FMay 6Apr 29Apr 19Apr 10Apr 3Mar 29Mar 24Mar 16Mar 8
16°FApr 18Mar 30Mar 22Mar 15Mar 9Mar 5Mar 1Feb 24Feb 17

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°FSep 3Sep 8Sep 12Sep 15Sep 18Sep 21Sep 25Sep 28Oct 3
28°FSep 17Sep 23Sep 27Oct 1Oct 3Oct 5Oct 9Oct 13Oct 18
24°FOct 2Oct 7Oct 12Oct 16Oct 19Oct 23Oct 28Nov 1Nov 8
20°FOct 14Oct 20Oct 25Oct 30Nov 2Nov 6Nov 12Nov 18Nov 26
16°FOct 24Nov 1Nov 7Nov 13Nov 18Nov 23Nov 29Dec 3Dec 11

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°F908376706560544839
32°F12811911210610094888169
28°F167158151146141135127119107
24°F205194186180174168161154145
20°F249238229221214206197188176
16°F279269262254248241233224211

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
7,252
Cooling degree days, base 65°F
164
Growing degree days, base 40°F
3,271
Growing degree days, base 45°F
2,296
Growing degree days, base 50°F
1,514
Growing degree days, base 55°F
901
Growing degree days, base 60°F
447

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,07300
February91000
March87101
April696015
May471199
June27015222
July8177463
August9059436
September25611229
October572048
November86302
December1,10000

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 14.8 km from La Pine. 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 USC00359316 (Wickiup Dam). Public domain.