Frost Dates for 83352 — Shoshone, Idaho

Half of springs at Shoshone 1 WNW, 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 12. Planting tender crops after May 1 leaves a 30% risk of a frost on them, after May 5 20%, and after May 12 10%. The 18 days between the even-odds date and the one-in-ten date is narrower than at 42% of the 67 Idaho stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 16 in half of years, as early as October 2 one year in ten, and holds off past November 1 one year in ten. A hard freeze of 28°F follows 10 days later, around October 26; in spring the one-in-ten date for 28°F is April 28, 14 days before the 32°F one. The freeze-free season lasts 173 days in a typical year, longer than at 87% of the 67 Idaho stations; it reaches 195 days one year in ten and falls short of 151 one year in ten. On average 149 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 15 days longer, to about May 9, and return around October 4. Severe cold of 16°F or below comes every winter, usually between November 28 and February 21.

July is the warmest month at Shoshone 1 WNW, ID, averaging 94°F by day and 62°F at night; January is the coldest at 37°F and 23°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 31% of years.

Warmth for growing adds up to 3,355 growing degree days a year (base 50°F), more than at 99% of the 67 Idaho stations. 30% of them (1,018) have built up by the end of June, and July adds the most, 865. Precipitation totals 10.6 inches a year, most in December (1.7") and least in July (0.2"); May to September bring 25% of it.

The nearest other station, Jerome Co Airport, ID, 22 miles south of Shoshone, has a last frost 7 days later (May 1), a first frost 2 days earlier (October 14), a season 8 days shorter.

The first measurable snow (0.1 inch or more) in Shoshone usually arrives around December 11, and the last of the season around February 17. Those are the middle dates across the winters of 1991–2020 at Shoshone 1 WNW, ID, 6.8 miles away: half of years saw snow earlier, half later. Snow fell in 76% of those winters. The last 32°F night of spring typically comes 66 days after the last snow.

ZIP 83352 is 7 miles from Shoshone 1 WNW, ID, which stands at 3,950 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 83352 in zone 6a, the band where the coldest night of the year averaged -10 to -5°F (-23.3 to -20.6°C) over 1991–2020; a zone describes winter lows, not frost dates.