Frost Dates for 97004 — Beavercreek, Oregon

Half of springs at Molalla 7NE, OR see their last 32°F night by March 16; only one in ten is past it by February 24, and one in ten still has one after April 12. Planting tender crops after March 27 leaves a 30% risk of a frost on them, after April 1 20%, and after April 12 10%. The 27 days between the even-odds date and the one-in-ten date is wider than at 75% 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 19 in half of years, as early as October 31 one year in ten, and holds off past December 9 one year in ten. A hard freeze of 28°F follows 17 days later, around December 6; in spring the one-in-ten date for 28°F is March 10, 33 days before the 32°F one. The freeze-free season lasts 247 days in a typical year, longer than at 83% of the 103 Oregon stations; it reaches 279 days one year in ten and falls short of 214 one year in ten. On average 42 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 15, and return around November 1. Nights of 24°F, cold enough to damage hardier plants, come in 72% of winters and 16°F in 7%.

August is the warmest month at Molalla 7NE, OR, averaging 82°F by day and 56°F at night; December is the coldest at 46°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 76% of years and April still brings one in 20% of years.

Warmth for growing adds up to 2,499 growing degree days a year (base 50°F), more than at 70% of the 103 Oregon stations. 29% of them (720) have built up by the end of June, and August adds the most, 597. Precipitation totals 46.5 inches a year, most in November (6.9") and least in July (0.6"); May to September bring 19% of it.

The nearest other station, Estacada 2 SE, OR, 8 miles east of Beavercreek, has a last frost 11 days later (March 27), a first frost 5 days earlier (November 14), a season 17 days shorter.

Measurable snow is rare here: only 11 of 26 winters from 1991 to 2020 recorded 0.1 inch or more at Estacada 2 SE, OR, 7.8 miles away, so there is no typical first-snow date to plan around.

ZIP 97004 is 6 miles from Molalla 7NE, OR, which stands at 647 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 3 other ZIP codes share the station; its figures are presented in full for 97038 (Molalla). The 2023 USDA Plant Hardiness Zone Map lists ZIP 97004 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.