U.S. Frost Dates by Weather Station

NOAA station USC00427559 · Utah

Frost Dates for Salina, UT

NOAA weather station Salina 24 E (USC00427559), Utah · elevation 7560 ft (2304 m) · hardiness zone 6b*

  • Lower-risk planting dateafter June 15only 1 spring in 10 still has a frost later
  • Typical last frostMay 2950% chance of a frost after it
  • Typical first fall frostSeptember 2650% chance of a frost before it
  • Frost-free season118 daystypical year, 32°F
  • Hardiness zone6bcalculated*

The year at a glance

Frost season at Salina, UTSpring: a frost after May 12 in 9 years out of 10, after May 29 in half of the years, after June 15 in 1 year out of 10. Fall: the first frost comes before September 12 in 1 year out of 10, before September 26 in half of the years, before October 9 in 9 years out of 10. Typical frost-free season: 118 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~May 29First frost ~Sep 26Frost season at Salina, UTSpring: a frost after May 12 in 9 years out of 10, after May 29 in half of the years, after June 15 in 1 year out of 10. Fall: the first frost comes before September 12 in 1 year out of 10, before September 26 in half of the years, before October 9 in 9 years out of 10. Typical frost-free season: 118 days.JFMAMJJASONDLast frost ~May 29First frost ~Sep 26
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)June 15September 12
50% (typical)May 29September 26
90% (likely)May 12October 9
Frost-free season (32°F, 50% chance)
118 days
Hard frost (28°F), last in spring, 50% chance after
May 13
Hard frost (28°F), first in fall, 50% chance before
October 6

The last 15 years (2006–2020 normals)

Typical last frost May 29 (same as the 30-year normal), typical first fall frost September 26. Frost-free season 118 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 Salina: chance of a frost after this dateSpring, chance of a frost after the date: 10% June 15, 20% June 8, 30% June 3, 40% May 31, 50% May 29, 60% May 26, 70% May 23, 80% May 18, 90% May 12. Observed last spring frost in recent years: 2021 June 9, 2022 June 1, 2023 May 6, 2024 May 24, 2025 May 19, 2026 May 21.Spring: last frostChance of a frost after this date10%50%90%May 1Jun 1Jun 15May 29May 122021: June 92022: June 12023: May 62024: May 242025: May 192026: May 21Fall at Salina: chance of a frost before this dateFall, chance of a frost before the date: 10% September 12, 20% September 17, 30% September 20, 40% September 23, 50% September 26, 60% September 28, 70% September 30, 80% October 4, 90% October 9. Observed first fall frost in recent years: 2021 September 28, 2023 October 11, 2025 October 5.Fall: first frostChance of a frost before this date10%50%90%Sep 1Oct 1Sep 12Sep 26Oct 92021: September 282023: October 112025: 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
2021June 9September 28
2022June 1incomplete record
2023May 6October 11
2024May 24incomplete record
2025May 19October 5
2026May 21season not over yet

What these dates mean

June 15 is the cautious spring date, meaning there is only a 10 % chance of a light frost after that day and it allows a gardener to set out tender crops with minimal risk. The 50% date is May 29; at that point an even chance exists of a frost later in spring. The 90 % chance date, May 12, would be a gamble for early planting.

In fall the cautious date is September 12, when there is a 10 % chance of a light frost earlier, so it marks the latest reliable day to finish harvesting tender crops. The 50% date is September 26, indicating an even chance of a frost earlier in the season, while October 9 carries a 90 % chance of a frost and would be risky for late crops. Hard frost at 28 °F can damage plants that survive a light frost at 32 °F, making the median hard-frost dates May 13 and October 6 especially important thresholds.

How to read the probabilities

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

  • Spring: "10% after June 15" 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 12" 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 Salina, UTNumbered nearest stations: 1 — Ferron, UT — 19 mi; 2 — Manti, UT — 26 mi; 3 — Ephraim, UT — 32 mi; 4 — near Richfield, UT — 37 mi; 5 — Capitol Reef National Park, UT — 44 mi.25 mi · 40 km1. Ferron, UT — 19 mi12. Manti, UT — 26 mi23. Ephraim, UT — 32 mi34. near Richfield, UT — 37 mi45. Capitol Reef National Park, UT — 44 mi5
  1. Ferron, UT 19 mi (31 km)
  2. Manti, UT 26 mi (43 km)
  3. Ephraim, UT 32 mi (52 km)
  4. near Richfield, UT 37 mi (60 km)
  5. Capitol Reef National Park, UT 44 mi (70 km)

Sources

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

Station coordinates: 38.9128, -111.4164.