Frost Dates for 97358 — Lyons, Oregon

Half of springs at Silver Creek Falls, OR see their last 32°F night by April 30; only one in ten is past it by April 10, and one in ten still has one after May 15. Planting tender crops after May 5 leaves a 30% risk of a frost on them, after May 9 20%, and after May 15 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 95% of the 103 Oregon stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 22 in half of years, as early as October 2 one year in ten, and holds off past November 12 one year in ten. A hard freeze of 28°F follows 22 days later, around November 13; in spring the one-in-ten date for 28°F is April 28, 17 days before the 32°F one. The freeze-free season lasts 174 days in a typical year, shorter than at 67% of the 103 Oregon stations; it reaches 203 days one year in ten and falls short of 149 one year in ten. On average 85 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 17 days longer, to about May 17, and return around October 3. Nights of 24°F, cold enough to damage hardier plants, come in 95% of winters and 16°F in 27%.

July is the warmest month at Silver Creek Falls, OR, averaging 76°F by day and 50°F at night; December is the coldest at 42°F and 33°F. A freezing night is all but certain in every month from November to April (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 47% of years.

Warmth for growing adds up to 1,481 growing degree days a year (base 50°F), fewer than at 89% of the 103 Oregon stations. 24% of them (360) have built up by the end of June, and July adds the most, 411. Precipitation totals 69.0 inches a year, most in December (11.2") and least in July (0.7"); May to September bring 16% of it.

The nearest other station, Stayton, OR, 14 miles west of Lyons and 925 feet lower, has a last frost 32 days earlier (March 29), a first frost 15 days later (November 6), a season 48 days longer.

Measurable snow is rare here: only 5 of 27 winters from 1991 to 2020 recorded 0.1 inch or more at Stayton, OR, 13.6 miles away, so there is no typical first-snow date to plan around.

ZIP 97358 is 8 miles from Silver Creek Falls, OR, which stands at 1,350 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 97358 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.