Fremont climate

Fremont Frost Dates and Growing Season

NOAA 1991-2020 normals for Fremont 4 Wsw, 7.2 km from Fremont, elevation 800 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Fremont 4 Wsw. 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 8 and the first fall freeze around October 11, a growing season of about 155 days.

Median at 36°F
last May 21, first October 1
Median at 32°F
last May 8, first October 11
Median at 28°F
last April 27, first October 25

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 3May 30May 27May 24May 21May 19May 15May 11May 6
32°FMay 25May 20May 16May 12May 8May 5May 2Apr 29Apr 24
28°FMay 14May 7May 3Apr 30Apr 27Apr 23Apr 20Apr 17Apr 11
24°FMay 1Apr 24Apr 20Apr 17Apr 14Apr 10Apr 7Apr 3Mar 30
20°FApr 16Apr 10Apr 7Apr 4Apr 2Mar 31Mar 28Mar 23Mar 17
16°FApr 6Apr 1Mar 30Mar 27Mar 24Mar 21Mar 18Mar 14Mar 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 18Sep 23Sep 27Sep 30Oct 1Oct 4Oct 6Oct 9Oct 13
32°FSep 30Oct 3Oct 6Oct 9Oct 11Oct 14Oct 16Oct 20Oct 25
28°FOct 11Oct 15Oct 19Oct 22Oct 25Oct 28Oct 31Nov 2Nov 8
24°FOct 27Oct 31Nov 2Nov 4Nov 7Nov 10Nov 13Nov 18Nov 25
20°FNov 6Nov 11Nov 15Nov 18Nov 22Nov 25Nov 30Dec 3Dec 9
16°FNov 15Nov 22Nov 26Nov 30Dec 3Dec 6Dec 11Dec 16Dec 22

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°F152145141137132128125120113
32°F176168162158155151147142134
28°F200193188184180175171166159
24°F231223217213208204199194187
20°F258249243238233228224220213
16°F278271265260255250244239231

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
7,190
Cooling degree days, base 65°F
389
Growing degree days, base 40°F
4,200
Growing degree days, base 45°F
3,169
Growing degree days, base 50°F
2,272
Growing degree days, base 55°F
1,499
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
January1,31300
February1,14800
March1,004113
April627046
May30916214
June7380458
July27143581
August38105532
September17142329
October501291
November83108
December1,14900

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 7.2 km from Fremont. 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 USC00203025 (Fremont 4 Wsw). Public domain.