Frost Dates for 83672 — Weiser, Idaho

Half of springs at Weiser, ID see their last 32°F night by April 23; only one in ten is past it by April 3, and one in ten still has one after May 10. Planting tender crops after April 30 leaves a 30% risk of a frost on them, after May 4 20%, and after May 10 10%. The 17 days between the even-odds date and the one-in-ten date is narrower than at 54% of the 67 Idaho stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 13 in half of years, as early as October 1 one year in ten, and holds off past October 27 one year in ten. A hard freeze of 28°F follows 12 days later, around October 25; in spring the one-in-ten date for 28°F is April 27, 13 days before the 32°F one. The freeze-free season lasts 174 days in a typical year, longer than at 88% of the 67 Idaho stations; it reaches 197 days one year in ten and falls short of 151 one year in ten. On average 136 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 13 days longer, to about May 6, and return around October 4. Severe cold of 16°F or below comes every winter, usually between November 29 and February 10.

July is the warmest month at Weiser, ID, averaging 95°F by day and 61°F at night; January is the coldest at 36°F and 23°F. A freezing night is all but certain in every month from October to March (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 89% of years and May still brings one in 29% of years.

Warmth for growing adds up to 3,215 growing degree days a year (base 50°F), more than at 96% of the 67 Idaho stations. 31% of them (1,004) have built up by the end of June, and July adds the most, 862. Precipitation totals 13.5 inches a year, most in December (2.4") and least in August (0.3"); May to September bring 25% of it.

The nearest other station, Payette, ID, 16 miles south of Weiser, has a last frost 4 days earlier (April 19), a first frost 7 days later (October 20), a season 9 days longer.

The first measurable snow (0.1 inch or more) in Weiser usually arrives around November 29, and the last of the season around February 24. Those are the middle dates across the winters of 1991–2020 at Weiser, ID, 4.9 miles away: half of years saw snow earlier, half later. Every one of those winters saw snow. The last 32°F night of spring typically comes 58 days after the last snow.

ZIP 83672 is 5 miles from Weiser, ID, which stands at 2,120 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 83672 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.