Marsing climate

Marsing Frost Dates and Growing Season

NOAA 1991-2020 normals for Deer Flat Dam, 6.3 km from Marsing, elevation 2510 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Deer Flat 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 April 23 and the first fall freeze around October 18, a growing season of about 178 days.

Median at 36°F
last May 7, first October 4
Median at 32°F
last April 23, first October 18
Median at 28°F
last April 5, first October 30

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°FMay 28May 19May 14May 10May 7May 4May 1Apr 29Apr 24
32°FMay 9May 3Apr 29Apr 26Apr 23Apr 19Apr 15Apr 11Apr 5
28°FApr 25Apr 18Apr 14Apr 10Apr 5Apr 2Mar 30Mar 23Mar 15
24°FApr 6Apr 1Mar 27Mar 21Mar 15Mar 10Mar 6Mar 1Feb 23
20°FMar 17Mar 8Mar 3Feb 28Feb 24Feb 21Feb 17Feb 11Feb 4
16°FFeb 28Feb 23Feb 19Feb 14Feb 9Feb 4Jan 31Jan 20Jan 6

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 17Sep 24Sep 28Oct 1Oct 4Oct 6Oct 10Oct 14Oct 18
32°FOct 2Oct 8Oct 13Oct 15Oct 18Oct 21Oct 24Oct 27Nov 1
28°FOct 17Oct 21Oct 24Oct 28Oct 30Nov 1Nov 5Nov 9Nov 15
24°FOct 26Oct 31Nov 3Nov 6Nov 10Nov 14Nov 18Nov 22Nov 27
20°FNov 3Nov 10Nov 15Nov 19Nov 23Nov 26Nov 30Dec 4Dec 10
16°FNov 12Nov 20Nov 26Nov 30Dec 4Dec 7Dec 12Dec 17Dec 28

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°F169162157152148144139133125
32°F199191186182178174169164156
28°F233224219213207203196191184
24°F268259252247240234228221212
20°F297287281275270265260254243
16°F335323314306299292286278267

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
5,287
Cooling degree days, base 65°F
771
Growing degree days, base 40°F
5,358
Growing degree days, base 45°F
4,083
Growing degree days, base 50°F
2,992
Growing degree days, base 55°F
2,085
Growing degree days, base 60°F
1,349

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,01800
February77402
March586034
April4082103
May20031304
June59104495
July5301761
August8258714
September8772436
October3824132
November73809
December1,02102

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 6.3 km from Marsing. 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 USC00102444 (Deer Flat Dam). Public domain.