Frost Dates for 98595 — Westport, Washington

Half of springs at Grayland, WA see their last 32°F night by March 29; only one in ten is past it by February 28, and one in ten still has one after April 24. Planting tender crops after April 6 leaves a 30% risk of a frost on them, after April 15 20%, and after April 24 10%. The 26 days between the even-odds date and the one-in-ten date is wider than at 89% of the 113 Washington stations behind this site's ZIP pages, so a fixed calendar date is a gamble here.

In fall the first 32°F night comes by November 7 in half of years, as early as October 19 one year in ten, and holds off past December 1 one year in ten. A hard freeze of 28°F follows 24 days later, around December 1; in spring the one-in-ten date for 28°F is March 24, 31 days before the 32°F one. The freeze-free season lasts 224 days in a typical year, longer than at 77% of the 113 Washington stations; it reaches 258 days one year in ten and falls short of 190 one year in ten. On average 37 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 31 days longer, to about April 29, and return around October 16. Nights of 24°F, cold enough to damage hardier plants, come in 70% of winters and 16°F in 3%.

August is the warmest month at Grayland, WA, averaging 68°F by day and 52°F at night; December is the coldest at 48°F and 37°F. A freezing night is all but certain in every month from December to February (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month. In spring, March still brings one in 83% of years and April still brings one in 39% of years.

Warmth for growing adds up to 1,304 growing degree days a year (base 50°F), fewer than at 97% of the 113 Washington stations. 28% of them (366) have built up by the end of June, and August adds the most, 308. Precipitation totals 75.3 inches a year, most in November (11.7") and least in July (1.1"); May to September bring 15% of it.

The nearest other station, Hoquiam Bowerman Airport, WA, 10 miles northeast of Westport, has a last frost 1 day later (March 30), a first frost 7 days later (November 14), a season 4 days longer.

Measurable snow is rare here: only 0 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Grayland, WA, 6.1 miles away, so there is no typical first-snow date to plan around.

ZIP 98595 is 6 miles from Grayland, WA, which stands at 10 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 98595 in zone 9a, the band where the coldest night of the year averaged 20 to 25°F (-6.7 to -3.9°C) over 1991–2020; a zone describes winter lows, not frost dates.