Frost Dates for 97426 — Creswell, Oregon

Half of springs at Cottage Grove 2E, OR see their last 32°F night by April 24; only one in ten is past it by March 31, and one in ten still has one after May 10. Planting tender crops after May 1 leaves a 30% risk of a frost on them, after May 4 20%, and after May 10 10%. The 16 days between the even-odds date and the one-in-ten date is narrower than at 91% of the 103 Oregon stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 25 in half of years, as early as September 30 one year in ten, and holds off past November 16 one year in ten. A hard freeze of 28°F follows 24 days later, around November 18; in spring the one-in-ten date for 28°F is April 22, 18 days before the 32°F one. The freeze-free season lasts 183 days in a typical year, shorter than at 61% of the 103 Oregon stations; it reaches 216 days one year in ten and falls short of 151 one year in ten. On average 59 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 18 days longer, to about May 12, and return around October 1. Nights of 24°F, cold enough to damage hardier plants, come in 95% of winters and 16°F in 29%.

July is the warmest month at Cottage Grove 2E, OR, averaging 82°F by day and 51°F at night; December is the coldest at 47°F and 33°F. A freezing night is all but certain in every month from November to March (a 90% chance or more). From June to August the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 84% of years and May still brings one in 33% of years.

Warmth for growing adds up to 2,107 growing degree days a year (base 50°F), fewer than at 57% of the 103 Oregon stations. 28% of them (599) have built up by the end of June, and July adds the most, 513. Precipitation totals 46.6 inches a year, most in December (7.6") and least in July (0.4"); May to September bring 15% of it.

The nearest other station, Lookout Pt Dam, OR, 13 miles east of Creswell, has a last frost 48 days earlier (March 7), a first frost 33 days later (November 27), a season 80 days longer.

Measurable snow is rare here: only 8 of 26 winters from 1991 to 2020 recorded 0.1 inch or more at Dorena, OR, 9.5 miles away, so there is no typical first-snow date to plan around.

ZIP 97426 is 8 miles from Cottage Grove 2E, OR, which stands at 595 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 97424 (Cottage Grove). The 2023 USDA Plant Hardiness Zone Map lists ZIP 97426 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.