Frost Dates for 83676 — Wilder, Idaho

Half of springs at Homedale 1 SE, ID see their last 32°F night by April 24; only one in ten is past it by April 9, and one in ten still has one after May 5. Planting tender crops after April 29 leaves a 30% risk of a frost on them, after May 1 20%, and after May 5 10%. The 11 days between the even-odds date and the one-in-ten date is the narrowest of the 67 Idaho stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 9 in half of years, as early as September 26 one year in ten, and holds off past October 23 one year in ten. A hard freeze of 28°F follows 13 days later, around October 22; in spring the one-in-ten date for 28°F is April 25, 10 days before the 32°F one. The freeze-free season lasts 169 days in a typical year, longer than at 82% of the 67 Idaho stations; it reaches 187 days one year in ten and falls short of 150 one year in ten. On average 161 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 11 days longer, to about May 5, and return around September 28. Severe cold of 16°F or below comes every winter, usually between November 28 and February 8.

July is the warmest month at Homedale 1 SE, ID, averaging 92°F by day and 59°F at night; January is the coldest at 38°F and 23°F. A freezing night is all but certain in every month from October to April (a 90% chance or more). From June to August the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 23% of years.

Warmth for growing adds up to 2,961 growing degree days a year (base 50°F), more than at 87% of the 67 Idaho stations. 32% of them (937) have built up by the end of June, and July adds the most, 797. Precipitation totals 10.2 inches a year, most in January (1.5") and least in August (0.2"); May to September bring 29% of it.

The nearest other station, Deer Flat Dam, ID, 9 miles southeast of Wilder and 280 feet higher, has a last frost 1 day earlier (April 23), a first frost 9 days later (October 18), a season 9 days longer.

The first measurable snow (0.1 inch or more) in Wilder usually arrives around December 18, and the last of the season around January 28. Those are the middle dates across the winters of 1991–2020 at Homedale 1 SE, ID, 3.5 miles away: half of years saw snow earlier, half later. Snow fell in 81% of those winters. The last 32°F night of spring typically comes 86 days after the last snow.

ZIP 83676 is 4 miles from Homedale 1 SE, ID, which stands at 2,230 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 83676 in zone 7a, the band where the coldest night of the year averaged 0 to 5°F (-17.8 to -15.0°C) over 1991–2020; a zone describes winter lows, not frost dates.