Farr West climate

Farr West Frost Dates and Growing Season

NOAA 1991-2020 normals for Ogden Sugar Factory, 7.2 km from Farr West, elevation 4280 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Ogden Sugar Factory. 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 22 and the first fall freeze around October 18, a growing season of about 177 days.

Median at 36°F
last May 7, first October 6
Median at 32°F
last April 22, first October 18
Median at 28°F
last April 3, first October 29

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 26May 18May 15May 10May 7May 3May 1Apr 28Apr 22
32°FMay 9May 3Apr 30Apr 26Apr 22Apr 18Apr 14Apr 10Apr 5
28°FApr 22Apr 15Apr 10Apr 6Apr 3Mar 31Mar 26Mar 18Mar 12
24°FApr 4Mar 30Mar 23Mar 17Mar 13Mar 10Mar 7Mar 3Feb 27
20°FMar 16Mar 11Mar 7Mar 4Mar 1Feb 27Feb 22Feb 16Feb 9
16°FMar 7Mar 2Feb 27Feb 22Feb 18Feb 14Feb 9Feb 3Jan 24

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 23Sep 28Oct 1Oct 4Oct 6Oct 9Oct 13Oct 17Oct 21
32°FOct 1Oct 7Oct 11Oct 16Oct 18Oct 21Oct 24Oct 27Nov 2
28°FOct 15Oct 20Oct 24Oct 26Oct 29Nov 1Nov 4Nov 7Nov 13
24°FOct 23Oct 29Nov 2Nov 5Nov 9Nov 12Nov 15Nov 19Nov 24
20°FNov 2Nov 7Nov 11Nov 16Nov 20Nov 23Nov 26Nov 29Dec 4
16°FNov 11Nov 17Nov 21Nov 25Nov 28Dec 1Dec 6Dec 12Dec 18

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°F173166161156152148143137130
32°F201193187182177172167162154
28°F231224218213208203198191183
24°F260253247241236231226220210
20°F286278272267262257251245237
16°F311300293288283278272265257

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
5,590
Cooling degree days, base 65°F
1,131
Growing degree days, base 40°F
5,676
Growing degree days, base 45°F
4,464
Growing degree days, base 50°F
3,409
Growing degree days, base 55°F
2,510
Growing degree days, base 60°F
1,756

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,11300
February85701
March647025
April4314108
May19041329
June37193606
July2415878
August4367827
September81106477
October3875145
November764011
December1,07900

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 Farr West. 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 USC00426414 (Ogden Sugar Factory). Public domain.