Frost Dates for 83860 — Sagle, Idaho

Half of springs at Sandpoint Exp Stn, ID see their last 32°F night by May 8; only one in ten is past it by April 23, and one in ten still has one after May 25. Planting tender crops after May 15 leaves a 30% risk of a frost on them, after May 20 20%, and after May 25 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 September 28 in half of years, as early as September 11 one year in ten, and holds off past October 11 one year in ten. A hard freeze of 28°F follows 12 days later, around October 10; in spring the one-in-ten date for 28°F is May 7, 18 days before the 32°F one. The freeze-free season lasts 141 days in a typical year, shorter than at 60% of the 67 Idaho stations; it reaches 161 days one year in ten and falls short of 118 one year in ten. On average 156 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 20 days longer, to about May 28, and return around September 13. Severe cold of 16°F or below comes every winter, usually between November 27 and March 1.

July is the warmest month at Sandpoint Exp Stn, ID, averaging 82°F by day and 52°F at night; December is the coldest at 34°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 70% of years.

Warmth for growing adds up to 1,745 growing degree days a year (base 50°F), fewer than at 81% of the 67 Idaho stations. 27% of them (479) have built up by the end of June, and July adds the most, 518. Precipitation totals 34.0 inches a year, most in November (4.7") and least in August (0.8"); May to September bring 25% of it.

The nearest other station, Bayview Model Basin, ID, 16 miles south of Sagle, has a last frost 14 days later (May 22), a first frost 6 days earlier (September 22), a season 19 days shorter.

The first measurable snow (0.1 inch or more) in Sagle usually arrives around November 17, and the last of the season around March 21. Those are the middle dates across the winters of 1991–2020 at Sandpoint Exp Stn, ID, 6.1 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 48 days after the last snow.

ZIP 83860 is 6 miles from Sandpoint Exp Stn, ID, which stands at 2,126 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 83864 (Sandpoint). The 2023 USDA Plant Hardiness Zone Map lists ZIP 83860 in zone 6b, the band where the coldest night of the year averaged -5 to 0°F (-20.6 to -17.8°C) over 1991–2020; a zone describes winter lows, not frost dates.