Frost Dates for 97013 — Canby, Oregon

Half of springs at N Willamette Exp Stn, OR see their last 32°F night by March 18; only one in ten is past it by February 22, and one in ten still has one after April 10. Planting tender crops after March 28 leaves a 30% risk of a frost on them, after April 2 20%, and after April 10 10%. The 23 days between the even-odds date and the one-in-ten date is wider than at 56% of the 103 Oregon 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 13 in half of years, as early as October 27 one year in ten, and holds off past December 6 one year in ten. A hard freeze of 28°F follows 18 days later, around December 1; in spring the one-in-ten date for 28°F is March 10, 31 days before the 32°F one. The freeze-free season lasts 243 days in a typical year, longer than at 80% of the 103 Oregon stations; it reaches 275 days one year in ten and falls short of 210 one year in ten. On average 45 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 30 days longer, to about April 17, and return around October 27. Nights of 24°F, cold enough to damage hardier plants, come in 73% of winters and 16°F in 7%.

August is the warmest month at N Willamette Exp Stn, OR, averaging 82°F by day and 55°F at night; December is the coldest at 47°F and 36°F. A freezing night is all but certain in every month from December to January (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 90% of years and March still brings one in 76% of years and April still brings one in 20% of years.

Warmth for growing adds up to 2,490 growing degree days a year (base 50°F), more than at 69% of the 103 Oregon stations. 30% of them (741) have built up by the end of June, and August adds the most, 581. Precipitation totals 42.4 inches a year, most in December (6.6") and least in July (0.5"); May to September bring 16% of it.

The nearest other station, Aurora State Airport, OR, 4 miles west of Canby, has a last frost 2 days earlier (March 16), a first frost 1 day later (November 14), a season 1 day shorter.

Measurable snow is rare here: only 0 of 15 winters from 1991 to 2020 recorded 0.1 inch or more at N Willamette Exp Stn, OR, 4.1 miles away, so there is no typical first-snow date to plan around.

ZIP 97013 is 4 miles from N Willamette Exp Stn, OR, which stands at 150 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 97070 (Wilsonville). The 2023 USDA Plant Hardiness Zone Map lists ZIP 97013 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.