Coon Rapids climate

Coon Rapids Frost Dates and Growing Season

NOAA 1991-2020 normals for Mpls Crystal AP, 8.1 km from Coon Rapids, elevation 861 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Mpls Crystal AP. 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 30 and the first fall freeze around October 8, a growing season of about 159 days.

Median at 36°F
last May 9, first September 29
Median at 32°F
last April 30, first October 8
Median at 28°F
last April 20, first October 18

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

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 22Sep 25Sep 27Sep 29Oct 1Oct 4Oct 7Oct 11
32°FSep 26Sep 29Oct 2Oct 6Oct 8Oct 11Oct 13Oct 16Oct 21
28°FOct 4Oct 9Oct 13Oct 16Oct 18Oct 21Oct 24Oct 28Nov 1
24°FOct 14Oct 21Oct 24Oct 27Oct 30Nov 1Nov 3Nov 6Nov 12
20°FOct 27Oct 31Nov 2Nov 4Nov 7Nov 9Nov 13Nov 16Nov 22
16°FNov 1Nov 6Nov 9Nov 12Nov 15Nov 18Nov 21Nov 25Dec 1

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°F158152148144141136132127120
32°F177171166162159155152147139
28°F201193188183179175170166157
24°F220213208204201196192188181
20°F240233227222219215211206199
16°F256249244239235231227222215

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
7,654
Cooling degree days, base 65°F
703
Growing degree days, base 40°F
4,707
Growing degree days, base 45°F
3,676
Growing degree days, base 50°F
2,755
Growing degree days, base 55°F
1,946
Growing degree days, base 60°F
1,262

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,53300
February1,26401
March1,008012
April576369
May24336278
June42145553
July6251710
August12192645
September14969380
October524799
November93608
December1,36100

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 8.1 km from Coon Rapids. 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 USW00094960 (Mpls Crystal AP). Public domain.