Hubbard County climate

Hubbard County Frost Dates and Growing Season

NOAA 1991-2020 normals for Itasca Univ Of Minn, 24.5 km from Hubbard County, elevation 1490 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Itasca Univ Of Minn. 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 18 and the first fall freeze around September 27, a growing season of about 130 days.

Median at 36°F
last May 29, first September 17
Median at 32°F
last May 18, first September 27
Median at 28°F
last May 6, first October 8

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

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 1Sep 6Sep 10Sep 14Sep 17Sep 19Sep 22Sep 25Sep 28
32°FSep 12Sep 18Sep 21Sep 24Sep 27Sep 30Oct 1Oct 5Oct 10
28°FSep 23Sep 29Oct 1Oct 5Oct 8Oct 11Oct 14Oct 18Oct 22
24°FOct 5Oct 10Oct 14Oct 17Oct 20Oct 23Oct 26Oct 30Nov 3
20°FOct 17Oct 22Oct 26Oct 29Oct 31Nov 2Nov 5Nov 8Nov 12
16°FOct 28Oct 31Nov 2Nov 5Nov 7Nov 10Nov 13Nov 16Nov 21

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°F1271211171141111071029790
32°F149143138134130126122117111
28°F172166162157153149144139132
24°F194187183178174170166161153
20°F212207202198195191187182175
16°F226220216212209206203198192

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
9,794
Cooling degree days, base 65°F
262
Growing degree days, base 40°F
3,446
Growing degree days, base 45°F
2,564
Growing degree days, base 50°F
1,796
Growing degree days, base 55°F
1,145
Growing degree days, base 60°F
626

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,82000
February1,52300
March1,27102
April795018
May40710151
June12750377
July47105522
August7577467
September28420220
October705138
November1,14901
December1,59200

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 24.5 km from Hubbard County. Low ground, valleys and open fields freeze earlier and later than a town center or a hillside.

More

Sources

NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal normals for station USC00214106 (Itasca Univ Of Minn). Public domain.