Munds Park climate

Munds Park Frost Dates and Growing Season

NOAA 1991-2020 normals for Mund's Park, 1.1 km from Munds Park, elevation 6470 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Mund's Park. 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 June 10 and the first fall freeze around September 27, a growing season of about 106 days.

Median at 36°F
last June 24, first September 17
Median at 32°F
last June 10, first September 27
Median at 28°F
last May 26, first October 7

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

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 5Sep 8Sep 12Sep 14Sep 17Sep 19Sep 22Sep 24Sep 27
32°FSep 14Sep 19Sep 22Sep 25Sep 27Sep 29Oct 1Oct 4Oct 8
28°FSep 26Sep 30Oct 2Oct 4Oct 7Oct 10Oct 13Oct 17Oct 22
24°FOct 6Oct 12Oct 15Oct 17Oct 20Oct 23Oct 27Nov 1Nov 4
20°FOct 17Oct 22Oct 26Oct 29Nov 1Nov 4Nov 7Nov 11Nov 16
16°FOct 27Nov 1Nov 6Nov 10Nov 14Nov 17Nov 21Nov 24Nov 30

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°F1009591868380746962
32°F126117113110106103989487
28°F157150143138133129125119113
24°F190182177172167163157152143
20°F221212208203198194189183174
16°F258251243237231226221214205

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
6,696
Cooling degree days, base 65°F
139
Growing degree days, base 40°F
3,622
Growing degree days, base 45°F
2,561
Growing degree days, base 50°F
1,689
Growing degree days, base 55°F
997
Growing degree days, base 60°F
474

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,04800
February89500
March83901
April647012
May434097
June17712291
July3772501
August4349471
September1975262
October518052
November80003
December1,06300

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 1.1 km from Munds Park. 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 USC00025780 (Mund's Park). Public domain.