U.S. Frost Dates by Weather Station

NOAA station USW00024128 · Nevada

Frost Dates for Winnemucca, NV

NOAA weather station Winnemucca Municipal Airport (USW00024128), Nevada · elevation 4296 ft (1309 m) · hardiness zone 6a*

  • Lower-risk planting dateafter June 19only 1 spring in 10 still has a frost later
  • Typical last frostMay 3150% chance of a frost after it
  • Typical first fall frostSeptember 1750% chance of a frost before it
  • Frost-free season108 daystypical year, 32°F
  • Hardiness zone6acalculated*

The year at a glance

Frost season at Winnemucca, NVSpring: a frost after May 10 in 9 years out of 10, after May 31 in half of the years, after June 19 in 1 year out of 10. Fall: the first frost comes before September 3 in 1 year out of 10, before September 17 in half of the years, before October 1 in 9 years out of 10. Typical frost-free season: 108 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~May 31First frost ~Sep 17Frost season at Winnemucca, NVSpring: a frost after May 10 in 9 years out of 10, after May 31 in half of the years, after June 19 in 1 year out of 10. Fall: the first frost comes before September 3 in 1 year out of 10, before September 17 in half of the years, before October 1 in 9 years out of 10. Typical frost-free season: 108 days.JFMAMJJASONDLast frost ~May 31First frost ~Sep 17
frost likely chance fading 90% → 10% frost-free in a typical yearThe year at a glance. Blue: frost is likely; the gradient fades as the chance drops from 90% to 10%; green: the frost-free part of a typical year.

Frost dates (32°F)

Probability of frost, based on 30 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)June 19September 3
50% (typical)May 31September 17
90% (likely)May 10October 1
Frost-free season (32°F, 50% chance)
108 days
Hard frost (28°F), last in spring, 50% chance after
May 13
Hard frost (28°F), first in fall, 50% chance before
September 29

The last 15 years (2006–2020 normals)

Typical last frost June 1 (1 day later than the 30-year normal), typical first fall frost September 19 (2 days later). Frost-free season 110 days.

A shorter, more recent NOAA period. The 30-year normals above remain the main reference: 15 years carry more year-to-year noise.

Add these dates to your calendar Yearly reminders for the typical last frost, the lower-risk planting date and the typical first fall frost (.ics).

How the chance of frost changes with the date

Spring at Winnemucca: chance of a frost after this dateSpring, chance of a frost after the date: 10% June 19, 20% June 12, 30% June 7, 40% June 4, 50% May 31, 60% May 27, 70% May 22, 80% May 16, 90% May 10. Observed last spring frost in recent years: 2021 May 20, 2022 June 20, 2023 June 20, 2024 May 26, 2025 June 22, 2026 May 20.Spring: last frostChance of a frost after this date10%50%90%May 1Jun 1Jul 1Jun 19May 31May 102021: May 202022: June 202023: June 202024: May 262025: June 222026: May 20Fall at Winnemucca: chance of a frost before this dateFall, chance of a frost before the date: 10% September 3, 20% September 9, 30% September 12, 40% September 15, 50% September 17, 60% September 20, 70% September 23, 80% September 27, 90% October 1. Observed first fall frost in recent years: 2021 September 20, 2022 September 22, 2023 September 23, 2024 October 1, 2025 October 5.Fall: first frostChance of a frost before this date10%50%90%Sep 1Oct 1Sep 3Sep 17Oct 12021: September 202022: September 222023: September 232024: October 12025: October 5
Two charts, because spring and fall answer different questions: in spring, the chance that a frost still comes after a date; in fall, the chance that the first frost has already come before it. NOAA publishes these odds from 10% to 90%, so the lines stop there. ◆ marks the actual date in each recent year.

What actually happened in recent years

Observed dates of the last spring and first fall frost (32°F) at this station; ◆ marks them on the charts above
YearLast spring frostFirst fall frost
2021May 20September 20
2022June 20September 22
2023June 20September 23
2024May 26October 1
2025June 22October 5
2026May 20season not over yet

What these dates mean

The 108 days between the 50% dates in Winnemucca—May 31 and September 17—define the period when a 32 °F frost is as likely as not. For a gardener this median point signals that frost risk is balanced, and planting or harvesting decisions should consider the probabilities that lie on either side of those dates.

In spring the cautious date for setting out tender crops is June 19, when there is only a 10 % chance of a frost later than that day; planting before May 10 carries a 90 % chance of a frost and is a gamble. In fall the cautious date to finish harvesting tender crops is September 3, with only a 10 % chance that a frost has arrived earlier, while aiming for October 1 involves a 90 % chance of a frost and is risky.

A hard frost at 28 °F—its 50% dates are May 13 and September 29—can damage plants that survive a light frost, making it a more serious threat.

How to read the probabilities

The dates are probabilities from 30 years of weather, not a forecast for this year.

  • Spring: "10% after June 19" means that in about one spring out of ten a frost still happens after that date. The 90% date is the earliest: a frost after it happens in most years.
  • Fall: "10% before September 3" means that in about one fall out of ten the first frost arrives before that date.
  • 50% is the typical date: half of the years are earlier, half are later.
  • A light frost (32°F) damages tender plants; a hard frost (28°F) also stops most hardy vegetables.

Nearby weather stations

Map of weather stations near Winnemucca, NVNumbered nearest stations: 1 — Imlay, NV — 25 mi; 2 — Orovada, NV — 46 mi; 3 — Battle Mountain, NV — 52 mi; 4 — Lovelock, NV — 62 mi; 5 — Beowawe, NV — 73 mi.NV25 mi · 40 km1. Imlay, NV — 25 mi12. Orovada, NV — 46 mi23. Battle Mountain, NV — 52 mi34. Lovelock, NV — 62 mi45. Beowawe, NV — 73 mi5
  1. Imlay, NV 25 mi (40 km)
  2. Orovada, NV 46 mi (74 km)
  3. Battle Mountain, NV 52 mi (84 km)
  4. Lovelock, NV 62 mi (99 km)
  5. Beowawe, NV 73 mi (118 km)

Sources

* Hardiness zone 6a: zone derived from PRISM 2023 grid at the station location (not the official USDA map). Source data: PRISM Group, Oregon State University.

Station coordinates: 40.9017, -117.8081.