Frost Dates for 98607 — Camas, Washington

Half of springs at Troutdale, OR see their last 32°F night by March 26; only one in ten is past it by February 27, and one in ten still has one after April 21. Planting tender crops after April 5 leaves a 30% risk of a frost on them, after April 12 20%, and after April 21 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 17 in half of years, as early as October 26 one year in ten, and holds off past December 10 one year in ten. A hard freeze of 28°F follows 20 days later, around December 7; in spring the one-in-ten date for 28°F is March 21, 31 days before the 32°F one. The freeze-free season lasts 237 days in a typical year, longer than at 86% of the 113 Washington stations; it reaches 272 days one year in ten and falls short of 202 one year in ten. On average 40 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 29 days longer, to about April 24, and return around October 30. Nights of 24°F, cold enough to damage hardier plants, come in 74% of winters and 16°F in 22%.

August is the warmest month at Troutdale, OR, averaging 81°F by day and 56°F at night; January is the coldest at 44°F and 35°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 77% of years and April still brings one in 38% of years.

Warmth for growing adds up to 2,453 growing degree days a year (base 50°F), more than at 74% of the 113 Washington stations. 30% of them (737) have built up by the end of June, and August adds the most, 572. Precipitation totals 48.4 inches a year, most in November (7.5") and least in July (0.6"); May to September bring 18% of it.

The nearest other station, Portland Troutdale Airport, OR, 4 miles south of Camas, has a last frost 10 days earlier (March 16), a first frost 3 days later (November 20), a season 13 days longer.

Measurable snow is rare here: only 5 of 27 winters from 1991 to 2020 recorded 0.1 inch or more at Troutdale, OR, 3.9 miles away, so there is no typical first-snow date to plan around.

ZIP 98607 is 4 miles from Troutdale, OR, which stands at 33 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 98607 in zone 8b, the band where the coldest night of the year averaged 15 to 20°F (-9.4 to -6.7°C) over 1991–2020; a zone describes winter lows, not frost dates.