Frost Dates for 83328 — Filer, Idaho

Half of springs at Buhl #2, ID see their last 32°F night by April 25; only one in ten is past it by April 8, and one in ten still has one after May 10. Planting tender crops after May 1 leaves a 30% risk of a frost on them, after May 4 20%, and after May 10 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 78% of the 67 Idaho stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 15 in half of years, as early as September 29 one year in ten, and holds off past October 29 one year in ten. A hard freeze of 28°F follows 11 days later, around October 26; in spring the one-in-ten date for 28°F is April 25, 15 days before the 32°F one. The freeze-free season lasts 172 days in a typical year, longer than at 85% of the 67 Idaho stations; it reaches 193 days one year in ten and falls short of 150 one year in ten. On average 144 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 10, and return around October 2. Severe cold of 16°F or below comes every winter, usually between November 26 and February 16.

July is the warmest month at Buhl #2, ID, averaging 88°F by day and 60°F at night; January is the coldest at 37°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 33% of years.

Warmth for growing adds up to 2,719 growing degree days a year (base 50°F), more than at 75% of the 67 Idaho stations. 28% of them (770) have built up by the end of June, and July adds the most, 745. Precipitation totals 10.3 inches a year, most in May (1.4") and least in July (0.2"); May to September bring 30% of it.

The nearest other station, Twin Falls Sun Vly Regional Airport, ID, 9 miles southeast of Filer and 351 feet higher, has a last frost 14 days later (May 9), a first frost 11 days earlier (October 4), a season 25 days shorter.

The first measurable snow (0.1 inch or more) in Filer usually arrives around November 22, and the last of the season around March 28. Those are the middle dates across the winters of 1991–2020 at Twin Falls 6 E, ID, 14 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 28 days after the last snow.

ZIP 83328 is 7 miles from Buhl #2, ID, which stands at 3,800 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 83316 (Buhl). The 2023 USDA Plant Hardiness Zone Map lists ZIP 83328 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.