Frost Dates for 83335 — Hazelton, Idaho

Half of springs at Hazelton, ID see their last 32°F night by May 7; only one in ten is past it by April 24, and one in ten still has one after May 26. Planting tender crops after May 13 leaves a 30% risk of a frost on them, after May 17 20%, and after May 26 10%. The 19 days between the even-odds date and the one-in-ten date is wider than at 60% of the 67 Idaho stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 5 in half of years, as early as September 19 one year in ten, and holds off past October 19 one year in ten. A hard freeze of 28°F follows 12 days later, around October 17; in spring the one-in-ten date for 28°F is May 8, 18 days before the 32°F one. The freeze-free season lasts 149 days in a typical year, longer than at 51% of the 67 Idaho stations; it reaches 169 days one year in ten and falls short of 126 one year in ten. On average 157 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 May 25, and return around September 22. Severe cold of 16°F or below comes every winter, usually between November 18 and February 25.

July is the warmest month at Hazelton, ID, averaging 89°F by day and 56°F at night; January is the coldest at 36°F and 20°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 73% of years.

Warmth for growing adds up to 2,428 growing degree days a year (base 50°F), more than at 61% of the 67 Idaho stations. 27% of them (663) have built up by the end of June, and July adds the most, 702. Precipitation totals 10.9 inches a year, most in December (1.6") and least in July (0.2"); May to September bring 28% of it.

The nearest other station, Twin Falls 6 E, ID, 15 miles west of Hazelton, has a last frost 1 day earlier (May 6), a first frost 2 days earlier (October 3), a season 1 day longer.

The first measurable snow (0.1 inch or more) in Hazelton usually arrives around November 29, and the last of the season around March 29. Those are the middle dates across the winters of 1991–2020 at Hazelton, ID, 4 miles away: half of years saw snow earlier, half later. Snow fell in 90% of those winters. The last 32°F night of spring typically comes 39 days after the last snow.

ZIP 83335 is 4 miles from Hazelton, ID, which stands at 4,060 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 83335 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.