U.S. Frost Dates by Weather Station

NOAA station USW00024193 · Utah

Frost Dates for Wendover, UT

NOAA weather station Wendover Airport Awos (USW00024193), Utah · elevation 4237 ft (1291 m) · hardiness zone 7a*

  • Lower-risk planting dateafter May 5only 1 spring in 10 still has a frost later
  • Typical last frostApril 1850% chance of a frost after it
  • Typical first fall frostOctober 2350% chance of a frost before it
  • Frost-free season188 daystypical year, 32°F
  • Hardiness zone7acalculated*

The year at a glance

Frost season at Wendover, UTSpring: a frost after March 31 in 9 years out of 10, after April 18 in half of the years, after May 5 in 1 year out of 10. Fall: the first frost comes before October 13 in 1 year out of 10, before October 23 in half of the years, before November 4 in 9 years out of 10. Typical frost-free season: 188 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 18First frost ~Oct 23Frost season at Wendover, UTSpring: a frost after March 31 in 9 years out of 10, after April 18 in half of the years, after May 5 in 1 year out of 10. Fall: the first frost comes before October 13 in 1 year out of 10, before October 23 in half of the years, before November 4 in 9 years out of 10. Typical frost-free season: 188 days.JFMAMJJASONDLast frost ~Apr 18First frost ~Oct 23
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 27 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)May 5October 13
50% (typical)April 18October 23
90% (likely)March 31November 4
Frost-free season (32°F, 50% chance)
188 days
Hard frost (28°F), last in spring, 50% chance after
March 31
Hard frost (28°F), first in fall, 50% chance before
November 1

The last 15 years (2006–2020 normals)

Typical last frost April 18 (same as the 30-year normal), typical first fall frost October 22 (1 day earlier). Frost-free season 188 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 Wendover: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 5, 20% April 29, 30% April 25, 40% April 20, 50% April 18, 60% April 13, 70% April 9, 80% April 4, 90% March 31. Observed last spring frost in recent years: 2025 April 19, 2026 April 19.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1May 5Apr 18Mar 312025: April 192026: April 19Fall at Wendover: chance of a frost before this dateFall, chance of a frost before the date: 10% October 13, 20% October 17, 30% October 19, 40% October 21, 50% October 23, 60% October 26, 70% October 28, 80% November 1, 90% November 4. Observed first fall frost in recent years: 2025 October 28.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 13Oct 23Nov 42025: October 28
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
2021no datano data
2022no datano data
2023no datano data
2024no datano data
2025April 19October 28
2026April 19season not over yet

What these dates mean

The 188 days between the 32°F 50% dates in Wendover frame the window that gardeners work within. The 50% dates—April 18 in spring and October 23 in fall—represent an even-odds point: a 50% chance of a light frost occurring later than April 18 and a 50% chance of a light frost occurring earlier than October 23.

In spring the cautious date for setting out tender crops is May 5, which carries only a 10% chance of a frost later; planting on March 31 carries a 90% chance and is a gamble. In fall the cautious date to finish harvesting tender crops is October 13, with a 10% chance of a frost earlier; waiting until November 4 carries a 90% chance and is risky.

The hard-frost 50% dates are March 31 and November 1, and a hard frost at 28°F can damage plants that would survive a light frost at 32°F.

How to read the probabilities

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

  • Spring: "10% after May 5" 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 October 13" 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 Wendover, UTNumbered nearest stations: 1 — Ibapah, UT — 47 mi; 2 — Lages, NV — 55 mi; 3 — Callao, UT — 59 mi; 4 — Partoun, UT — 76 mi; 5 — Ruby Lake NWR, NV — 85 mi.NVUT25 mi · 40 km1. Ibapah, UT — 47 mi12. Lages, NV — 55 mi23. Callao, UT — 59 mi34. Partoun, UT — 76 mi45. Ruby Lake NWR, NV — 85 mi5
  1. Ibapah, UT 47 mi (76 km)
  2. Lages, NV 55 mi (88 km)
  3. Callao, UT 59 mi (95 km)
  4. Partoun, UT 76 mi (122 km)
  5. Ruby Lake NWR, NV 85 mi (136 km)

Sources

* Hardiness zone 7a: zone derived from PRISM 2023 grid at the station location (not the official USDA map). Source data: PRISM Group, Oregon State University.

Station coordinates: 40.7206, -114.0358.