Frost Dates for 98245 — Eastsound, Washington

Half of springs at Olga 2 SE, WA see their last 32°F night by February 26; only one in ten is past it by January 23, and one in ten still has one after March 23. Planting tender crops after March 9 leaves a 30% risk of a frost on them, after March 14 20%, and after March 23 10%. The 25 days between the even-odds date and the one-in-ten date is wider than at 88% 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 29 in half of years, as early as November 10 one year in ten, and holds off past December 23 one year in ten. A hard freeze of 28°F follows 15 days later, around December 14; in spring the one-in-ten date for 28°F is February 26, 25 days before the 32°F one. The freeze-free season lasts 276 days in a typical year, the longest of the 113 Washington stations; it reaches 315 days one year in ten and falls short of 242 one year in ten. On average 32 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 March 29, and return around November 10. Nights of 24°F, cold enough to damage hardier plants, come in 60% of winters and 16°F in 4%.

July is the warmest month at Olga 2 SE, WA, averaging 69°F by day and 54°F at night; December is the coldest at 44°F and 38°F. From April to October the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 75% of years and March still brings one in 42% of years.

Warmth for growing adds up to 1,517 growing degree days a year (base 50°F), fewer than at 88% of the 113 Washington stations. 30% of them (447) have built up by the end of June, and July adds the most, 363. Precipitation totals 29.2 inches a year, most in November (4.6") and least in July (0.7"); May to September bring 22% of it.

The nearest other station, Friday Harbor Airport, WA, 11 miles southwest of Eastsound, has a last frost 28 days later (March 26), a first frost 19 days earlier (November 10), a season 46 days shorter.

The first measurable snow (0.1 inch or more) in Eastsound usually arrives around December 28, and the last of the season around January 15. Those are the middle dates across the winters of 1991–2020 at Olga 2 SE, WA, 6.7 miles away: half of years saw snow earlier, half later. Snow fell in 75% of those winters. The last 32°F night of spring typically comes 42 days after the last snow.

ZIP 98245 is 7 miles from Olga 2 SE, WA, which stands at 80 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 98245 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.