Stateline climate

Stateline Frost Dates and Growing Season

NOAA 1991-2020 normals for Dagget Pass, 4.6 km from Stateline, elevation 7334 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Dagget Pass. 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 28, a growing season of about 113 days.

Median at 36°F
last June 19, first September 15
Median at 32°F
last June 7, first September 28
Median at 28°F
last May 25, first October 12

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°FJul 8Jun 30Jun 25Jun 22Jun 19Jun 15Jun 12Jun 9Jun 5
32°FJun 24Jun 19Jun 14Jun 10Jun 7Jun 5Jun 2May 29May 21
28°FJun 12Jun 6Jun 2May 30May 25May 20May 15May 10May 3
24°FMay 31May 23May 14May 7May 3Apr 29Apr 25Apr 20Apr 13
20°FMay 14May 2Apr 27Apr 21Apr 17Apr 13Apr 8Apr 4Mar 28
16°FApr 25Apr 14Apr 7Apr 2Mar 30Mar 23Mar 17Mar 10Feb 28

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 29Sep 4Sep 9Sep 12Sep 15Sep 18Sep 22Sep 26Oct 1
32°FSep 10Sep 16Sep 21Sep 25Sep 28Oct 1Oct 5Oct 10Oct 16
28°FSep 22Sep 28Oct 2Oct 6Oct 12Oct 15Oct 20Oct 26Nov 1
24°FOct 3Oct 11Oct 17Oct 23Oct 28Nov 1Nov 4Nov 9Nov 14
20°FOct 19Oct 26Nov 1Nov 5Nov 9Nov 13Nov 17Nov 20Nov 26
16°FOct 30Nov 7Nov 12Nov 17Nov 21Nov 25Nov 29Dec 3Dec 10

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°F10910295918782777162
32°F1361281231171131081039890
28°F169159150146140134129123114
24°F201192184178171165158150138
20°F231222215208202195189182170
16°F273260250243236229220212198

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
7,935
Cooling degree days, base 65°F
47
Growing degree days, base 40°F
2,797
Growing degree days, base 45°F
1,896
Growing degree days, base 50°F
1,177
Growing degree days, base 55°F
621
Growing degree days, base 60°F
230

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,10400
February98000
March97000
April80103
May601045
June3214175
July11925372
August13216350
September2912194
October609037
November87902
December1,12700

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 4.6 km from Stateline. 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 USC00262119 (Dagget Pass). Public domain.