Boardman climate

Boardman Frost Dates and Growing Season

NOAA 1991-2020 normals for Warren 3 S, 23.3 km from Boardman, elevation 900 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Warren 3 S. 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 12, a growing season of about 157 days.

Median at 36°F
last May 19, first October 2
Median at 32°F
last May 8, first October 12
Median at 28°F
last April 27, first October 26

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

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 19Sep 24Sep 28Oct 1Oct 2Oct 4Oct 6Oct 10Oct 14
32°FSep 30Oct 3Oct 6Oct 9Oct 12Oct 14Oct 18Oct 22Oct 26
28°FOct 8Oct 15Oct 19Oct 23Oct 26Oct 29Nov 1Nov 4Nov 7
24°FOct 23Oct 28Oct 31Nov 2Nov 5Nov 8Nov 12Nov 16Nov 20
20°FNov 1Nov 6Nov 10Nov 14Nov 17Nov 21Nov 25Nov 30Dec 5
16°FNov 10Nov 17Nov 22Nov 27Nov 30Dec 3Dec 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°F156149144139134129125121114
32°F178172166161157153148143134
28°F202194189184179175170165156
24°F225218213210205200195189180
20°F253245239234228224219214207
16°F278269262257251246242234226

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
6,380
Cooling degree days, base 65°F
552
Growing degree days, base 40°F
4,787
Growing degree days, base 45°F
3,650
Growing degree days, base 50°F
2,658
Growing degree days, base 55°F
1,808
Growing degree days, base 60°F
1,097

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,21702
February1,05302
March907017
April524387
May24436282
June60111501
July12189642
August22151594
September13057380
October4336125
November735022
December1,04504

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 23.3 km from Boardman. 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 USC00338769 (Warren 3 S). Public domain.