Frost Dates for 97423 — Coquille, Oregon

Half of springs at Coquille City, OR see their last 32°F night by March 28; only one in ten is past it by February 22, and one in ten still has one after April 27. Planting tender crops after April 9 leaves a 30% risk of a frost on them, after April 16 20%, and after April 27 10%. The 30 days between the even-odds date and the one-in-ten date is wider than at 87% 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 6 in half of years, as early as October 17 one year in ten, and holds off past December 6 one year in ten. A hard freeze of 28°F follows 26 days later, around December 2; in spring the one-in-ten date for 28°F is March 22, 36 days before the 32°F one. The freeze-free season lasts 225 days in a typical year, longer than at 70% of the 103 Oregon stations; it reaches 269 days one year in ten and falls short of 189 one year in ten. On average 38 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 33 days longer, to about April 30, and return around October 18. Nights of 24°F, cold enough to damage hardier plants, come in 54% of winters and 16°F in 3%.

August is the warmest month at Coquille City, OR, averaging 74°F by day and 51°F at night; December is the coldest at 54°F and 36°F. A freezing night is all but certain in December (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 83% of years and March still brings one in 70% of years and April still brings one in 37% of years.

Warmth for growing adds up to 1,858 growing degree days a year (base 50°F), fewer than at 69% of the 103 Oregon stations. 30% of them (554) have built up by the end of June, and August adds the most, 388. Precipitation totals 54.9 inches a year, most in December (10.0") and least in July (0.3"); May to September bring 11% of it.

The nearest other station, Bandon 2 NNE, OR, 12 miles west of Coquille, has a last frost 19 days earlier (March 9), a first frost 21 days later (November 27), a season 35 days longer.

Measurable snow is rare here: only 4 of 21 winters from 1991 to 2020 recorded 0.1 inch or more at Coquille City, OR, 1.9 miles away, so there is no typical first-snow date to plan around.

ZIP 97423 is 2 miles from Coquille City, OR, which stands at 23 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 97423 in zone 9a, the band where the coldest night of the year averaged 20 to 25°F (-6.7 to -3.9°C) over 1991–2020; a zone describes winter lows, not frost dates.