U.S. Frost Dates by Weather Station

NOAA station USC00422607 · Utah

Frost Dates for Eskdale, UT

NOAA weather station Eskdale (USC00422607), Utah · elevation 4980 ft (1518 m) · hardiness zone 5b*

  • Lower-risk planting dateafter June 3only 1 spring in 10 still has a frost later
  • Typical last frostMay 1250% chance of a frost after it
  • Typical first fall frostOctober 150% chance of a frost before it
  • Frost-free season140 daystypical year, 32°F
  • Hardiness zone5bcalculated*

The year at a glance

Frost season at Eskdale, UTSpring: a frost after April 28 in 9 years out of 10, after May 12 in half of the years, after June 3 in 1 year out of 10. Fall: the first frost comes before September 19 in 1 year out of 10, before October 1 in half of the years, before October 13 in 9 years out of 10. Typical frost-free season: 140 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~May 12First frost ~Oct 1Frost season at Eskdale, UTSpring: a frost after April 28 in 9 years out of 10, after May 12 in half of the years, after June 3 in 1 year out of 10. Fall: the first frost comes before September 19 in 1 year out of 10, before October 1 in half of the years, before October 13 in 9 years out of 10. Typical frost-free season: 140 days.JFMAMJJASONDLast frost ~May 12First frost ~Oct 1
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 3September 19
50% (typical)May 12October 1
90% (likely)April 28October 13
Frost-free season (32°F, 50% chance)
140 days
Hard frost (28°F), last in spring, 50% chance after
April 29
Hard frost (28°F), first in fall, 50% chance before
October 10

The last 15 years (2006–2020 normals)

Typical last frost May 13 (1 day later than the 30-year normal), typical first fall frost October 1. Frost-free season 140 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 Eskdale: chance of a frost after this dateSpring, chance of a frost after the date: 10% June 3, 20% May 26, 30% May 20, 40% May 16, 50% May 12, 60% May 9, 70% May 5, 80% May 2, 90% April 28. Observed last spring frost in recent years: 2021 May 24, 2022 June 1, 2023 May 6, 2024 May 8, 2025 May 14, 2026 May 19.Spring: last frostChance of a frost after this date10%50%90%May 1Jun 1Jun 3May 12Apr 282021: May 242022: June 12023: May 62024: May 82025: May 142026: May 19Fall at Eskdale: chance of a frost before this dateFall, chance of a frost before the date: 10% September 19, 20% September 23, 30% September 26, 40% September 28, 50% October 1, 60% October 2, 70% October 5, 80% October 8, 90% October 13. Observed first fall frost in recent years: 2021 September 30, 2022 October 14, 2023 October 12, 2024 October 20, 2025 October 7.Fall: first frostChance of a frost before this date10%50%90%Oct 1Sep 19Oct 1Oct 132021: September 302022: October 142023: October 122024: October 202025: October 7
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 24September 30
2022June 1October 14
2023May 6October 12
2024May 8October 20
2025May 14October 7
2026May 19season not over yet

What these dates mean

June 3 is the cautious spring date for light frost in Eskdale, carrying only a 10 % chance that a frost will occur later; this lets a gardener plan to set out tender crops with relatively low risk.

The median, or 50 % date, is May 12 for spring light frost, meaning there is an even chance of a frost later than this day, while the 50 % date for fall light frost is October 1, indicating an even chance of a frost earlier than it. For a cautious fall schedule, September 19 is the early-season date with only a 10 % chance that a frost has already arrived, providing a benchmark to finish harvesting tender crops.

Hard frost at 28 °F is more damaging than a light frost at 32 °F because the lower temperature can kill plant tissue that would survive the milder chill.

How to read the probabilities

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

  • Spring: "10% after June 3" 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 19" 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 Eskdale, UTNumbered nearest stations: 1 — Partoun, UT — 36 mi; 2 — McGill, NV — 49 mi; 3 — near Ely, NV — 50 mi; 4 — Callao, UT — 56 mi; 5 — Black Rock, UT — 60 mi.UT25 mi · 40 km1. Partoun, UT — 36 mi12. McGill, NV — 49 mi23. near Ely, NV — 50 mi34. Callao, UT — 56 mi45. Black Rock, UT — 60 mi5
  1. Partoun, UT 36 mi (58 km)
  2. McGill, NV 49 mi (78 km)
  3. near Ely, NV 50 mi (80 km)
  4. Callao, UT 56 mi (90 km)
  5. Black Rock, UT 60 mi (97 km)

Sources

* Hardiness zone 5b: zone derived from PRISM 2023 grid at the station location (not the official USDA map). Source data: PRISM Group, Oregon State University.

Station coordinates: 39.1078, -113.9533.