Frost Dates for 83276 — Soda Springs, Idaho

Half of springs at Grace, ID see their last 32°F night by May 29; only one in ten is past it by May 11, and one in ten still has one after June 16. Planting tender crops after June 5 leaves a 30% risk of a frost on them, after June 11 20%, and after June 16 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 September 17 in half of years, as early as September 1 one year in ten, and holds off past October 1 one year in ten. A hard freeze of 28°F follows 14 days later, around October 1; in spring the one-in-ten date for 28°F is May 25, 22 days before the 32°F one. The freeze-free season lasts 111 days in a typical year, shorter than at 88% of the 67 Idaho stations; it reaches 136 days one year in ten and falls short of 86 one year in ten. On average 200 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 18 days longer, to about June 16, and return around September 4. Severe cold of 16°F or below comes every winter, usually between November 4 and March 27.

July is the warmest month at Grace, ID, averaging 85°F by day and 50°F at night; January is the coldest at 31°F and 13°F. A freezing night is all but certain in every month from October to May (a 90% chance or more). From July to August the chance of a 32°F night stays under 10% each month. In spring, June still brings one in 39% of years.

Warmth for growing adds up to 1,749 growing degree days a year (base 50°F), fewer than at 79% of the 67 Idaho stations. 24% of them (414) have built up by the end of June, and July adds the most, 547. Precipitation totals 15.1 inches a year, most in May (2.4") and least in July (0.8"); May to September bring 46% of it.

The nearest other station, Bern, ID, 27 miles south of Soda Springs and 414 feet higher, has a last frost 19 days later (June 17), a first frost 14 days earlier (September 3), a season 34 days shorter.

The first measurable snow (0.1 inch or more) in Soda Springs usually arrives around November 14, and the last of the season around April 19. Those are the middle dates across the winters of 1991–2020 at Soda Springs Airport, ID, 2.9 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 40 days after the last snow.

ZIP 83276 is 11 miles from Grace, ID, which stands at 5,550 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 83276 in zone 5a, the band where the coldest night of the year averaged -20 to -15°F (-28.9 to -26.1°C) over 1991–2020; a zone describes winter lows, not frost dates.