Frost Dates for 89406 — Fallon, Nevada

Half of springs at Fallon Naas, NV see their last 32°F night by May 6; only one in ten is past it by April 21, and one in ten still has one after May 25. Planting tender crops after May 14 leaves a 30% risk of a frost on them, after May 18 20%, and after May 25 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 October 8 in half of years, as early as September 25 one year in ten, and holds off past October 21 one year in ten. A hard freeze of 28°F follows 9 days later, around October 17; in spring the one-in-ten date for 28°F is May 11, 14 days before the 32°F one. The freeze-free season lasts 153 days in a typical year, shorter than at 61% of the 38 Nevada stations; it reaches 175 days one year in ten and falls short of 129 one year in ten. On average 139 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 21, and return around September 29. Severe cold of 16°F or below comes every winter, usually between November 20 and February 22.

July is the warmest month at Fallon Naas, NV, averaging 96°F by day and 58°F at night; December is the coldest at 46°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 65% of years.

Warmth for growing adds up to 3,309 growing degree days a year (base 50°F), more than at 53% of the 38 Nevada stations. 31% of them (1,035) have built up by the end of June, and July adds the most, 844. Precipitation totals 5.0 inches a year, most in May (0.9") and least in July (0.1"); May to September bring 34% of it.

The nearest other station, Lahontan Dam, NV, 20 miles west of Fallon and 233 feet higher, has a last frost 18 days earlier (April 18), a first frost 17 days later (October 25), a season 35 days longer.

The first measurable snow (0.1 inch or more) in Fallon usually arrives around January 4, and the last of the season around February 22. Those are the middle dates across the winters of 1991–2020 at Fallon Exp Stn, NV, 4.7 miles away: half of years saw snow earlier, half later. Snow fell in 79% of those winters. The last 32°F night of spring typically comes 73 days after the last snow.

ZIP 89406 is 3 miles from Fallon Naas, NV, which stands at 3,934 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 89406 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.