Netarts climate

Netarts Frost Dates and Growing Season

NOAA 1991-2020 normals for Tillamook, 7.6 km from Netarts, elevation 12 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Tillamook. 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 22 and the first fall freeze around October 21, a growing season of about 183 days.

Median at 36°F
last May 15, first September 30
Median at 32°F
last April 22, first October 21
Median at 28°F
last March 22, first November 15

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 5May 31May 27May 21May 15May 10May 6Apr 30Apr 26
32°FMay 13May 6May 2Apr 28Apr 22Apr 17Apr 12Apr 5Mar 28
28°FApr 20Apr 8Apr 1Mar 28Mar 22Mar 17Mar 11Mar 4Feb 22
24°FMar 15Mar 2Feb 25Feb 18Feb 10Jan 29Jan 14Jan 2Dec 17
20°FFeb 22Feb 12Jan 28Jan 14Jan 2Dec 28Dec 18Dec 12Dec 5
16°FJan 18Jan 3Dec 28Dec 24Dec 19Dec 15Dec 14Dec 10Dec 9

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 7Sep 14Sep 21Sep 26Sep 30Oct 3Oct 6Oct 12Oct 19
32°FSep 27Oct 3Oct 9Oct 15Oct 21Oct 26Nov 1Nov 7Nov 15
28°FOct 21Oct 30Nov 2Nov 9Nov 15Nov 23Dec 1Dec 6Dec 18
24°FNov 5Nov 17Nov 30Dec 5Dec 11Dec 21Jan 1Jan 16Feb 10
20°FNov 24Dec 5Dec 10Dec 15Dec 23Dec 31Jan 10Jan 27Feb 17
16°FDec 6Dec 10Dec 12Dec 14Dec 16Dec 20Dec 26Dec 31Jan 14

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°F165155147141135128122115105
32°F216204195190183176168162151
28°F283265254246236229220209193
24°F365345334320311304293279260
20°F365365365365365365353339322
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
100% of years
28°F or colder
100% of years
24°F or colder
86% of years
20°F or colder
36% of years
16°F or colder
10% 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
5,124
Cooling degree days, base 65°F
10
Growing degree days, base 40°F
4,092
Growing degree days, base 45°F
2,526
Growing degree days, base 50°F
1,314
Growing degree days, base 55°F
515
Growing degree days, base 60°F
112

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January634012
February568011
March589020
April501033
May392198
June2741179
July1882279
August1693299
September2264230
October3850111
November533033
December66609

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 7.6 km from Netarts. 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 USC00358494 (Tillamook). Public domain.