Frost Dates for 83332 — Hagerman, Idaho

Half of springs at Hagerman 2 SW, ID see their last 32°F night by May 3; only one in ten is past it by April 19, and one in ten still has one after May 17. Planting tender crops after May 8 leaves a 30% risk of a frost on them, after May 12 20%, and after May 17 10%. The 14 days between the even-odds date and the one-in-ten date is narrower than at 93% of the 67 Idaho stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 1 in half of years, as early as September 16 one year in ten, and holds off past October 16 one year in ten. A hard freeze of 28°F follows 14 days later, around October 15; in spring the one-in-ten date for 28°F is May 3, 14 days before the 32°F one. The freeze-free season lasts 151 days in a typical year, longer than at 58% of the 67 Idaho stations; it reaches 171 days one year in ten and falls short of 128 one year in ten. On average 142 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 16 days longer, to about May 19, and return around September 19. Severe cold of 16°F or below comes every winter, usually between November 22 and February 21.

July is the warmest month at Hagerman 2 SW, ID, averaging 92°F by day and 56°F at night; December is the coldest at 38°F and 22°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 58% of years.

Warmth for growing adds up to 2,709 growing degree days a year (base 50°F), more than at 72% of the 67 Idaho stations. 30% of them (816) have built up by the end of June, and July adds the most, 741. Precipitation totals 9.8 inches a year, most in December (1.6") and least in July (0.2"); May to September bring 24% of it.

The nearest other station, Buhl #2, ID, 17 miles southeast of Hagerman and 903 feet higher, has a last frost 8 days earlier (April 25), a first frost 14 days later (October 15), a season 21 days longer.

The first measurable snow (0.1 inch or more) in Hagerman usually arrives around December 13, and the last of the season around February 11. Those are the middle dates across the winters of 1991–2020 at Hagerman 2 SW, ID, 0.1 miles away: half of years saw snow earlier, half later. Snow fell in 84% of those winters. The last 32°F night of spring typically comes 81 days after the last snow.

ZIP 83332 is under a mile from Hagerman 2 SW, ID, which stands at 2,897 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 83330 (Gooding). The 2023 USDA Plant Hardiness Zone Map lists ZIP 83332 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.