Frost Dates for 89445 — Winnemucca, Nevada

Half of springs at Winnemucca Municipal Airport, NV see their last 32°F night by May 31; only one in ten is past it by May 10, and one in ten still has one after June 19. Planting tender crops after June 7 leaves a 30% risk of a frost on them, after June 12 20%, and after June 19 10%. The 19 days between the even-odds date and the one-in-ten date is narrower than at 63% of the 38 Nevada 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 3 one year in ten, and holds off past October 1 one year in ten. A hard freeze of 28°F follows 12 days later, around September 29; in spring the one-in-ten date for 28°F is June 8, 11 days before the 32°F one. The freeze-free season lasts 108 days in a typical year, shorter than at 95% of the 38 Nevada stations; it reaches 133 days one year in ten and falls short of 85 one year in ten. On average 182 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 12 days longer, to about June 12, and return around September 5. Severe cold of 16°F or below comes every winter, usually between October 31 and March 27.

July is the warmest month at Winnemucca Municipal Airport, NV, averaging 96°F by day and 54°F at night; December is the coldest at 43°F and 19°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 48% of years.

Warmth for growing adds up to 2,660 growing degree days a year (base 50°F), fewer than at 71% of the 38 Nevada stations. 29% of them (765) have built up by the end of June, and July adds the most, 759. Precipitation totals 8.4 inches a year, most in May (1.1") and least in August (0.1"); May to September bring 27% of it.

The first measurable snow (0.1 inch or more) in Winnemucca usually arrives around November 13, and the last of the season around April 18. Those are the middle dates across the winters of 1991–2020 at Winnemucca Municipal Airport, NV, 11.3 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 43 days after the last snow.

ZIP 89445 is 11 miles from Winnemucca Municipal Airport, NV, which stands at 4,296 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 89445 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.