Yachats climate

Yachats Frost Dates and Growing Season

NOAA 1991-2020 normals for Yachats, 2.2 km from Yachats, elevation 50 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Yachats. 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 February 19 and the first fall freeze around December 11, a growing season of about 303 days.

Median at 36°F
last April 4, first November 18
Median at 32°F
last February 19, first December 11
Median at 28°F
last January 9, first December 24

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°FApr 27Apr 19Apr 14Apr 9Apr 4Mar 31Mar 26Mar 20Mar 7
32°FMar 23Mar 10Mar 2Feb 25Feb 19Feb 10Jan 27Jan 5Dec 18
28°FFeb 24Feb 16Feb 5Jan 24Jan 9Dec 31Dec 21Dec 13Dec 7
24°FJan 2Dec 31Dec 26Dec 23Dec 21Dec 19Dec 16Dec 11Dec 5
20°F–––––––––
16°F–––––––––

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°FOct 25Nov 1Nov 8Nov 13Nov 18Nov 23Nov 28Dec 4Dec 13
32°FNov 12Nov 22Dec 1Dec 6Dec 11Dec 20Dec 30Jan 15Feb 13
28°FDec 1Dec 7Dec 11Dec 18Dec 24Jan 1Jan 21Feb 9Feb 19
24°FDec 4Dec 9Dec 13Dec 17Dec 20Dec 22Dec 23Dec 29Jan 1
20°F–––––––––
16°F–––––––––

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°F268252241233226219212205193
32°F363342327313303293281269250
28°F365365365365365361348334312
24°F365365365365365365365365365
20°F365365365365365365365365365
16°F365365365365365365365365365

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
92% of years
28°F or colder
42% of years
24°F or colder
10% of years
20°F or colder
2% of years
16°F or colder
0% 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
4,636
Cooling degree days, base 65°F
10
Growing degree days, base 40°F
4,523
Growing degree days, base 45°F
2,809
Growing degree days, base 50°F
1,381
Growing degree days, base 55°F
465
Growing degree days, base 60°F
87

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January532032
February489026
March522029
April449041
May3681109
June2684186
July2181248
August2130253
September2313223
October3281149
November449059
December570026

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 2.2 km from Yachats. 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 USC00359588 (Yachats). Public domain.