U.S. Frost Dates by Weather Station

NOAA station USC00424856 · Utah

Frost Dates for Laketown, UT

NOAA weather station Laketown (USC00424856), Utah · elevation 5980 ft (1823 m) · hardiness zone 5b*

  • Lower-risk planting dateafter June 17only 1 spring in 10 still has a frost later
  • Typical last frostMay 2850% chance of a frost after it
  • Typical first fall frostSeptember 2450% chance of a frost before it
  • Frost-free season119 daystypical year, 32°F
  • Hardiness zone5bcalculated*

The year at a glance

Frost season at Laketown, UTSpring: a frost after May 10 in 9 years out of 10, after May 28 in half of the years, after June 17 in 1 year out of 10. Fall: the first frost comes before September 11 in 1 year out of 10, before September 24 in half of the years, before October 8 in 9 years out of 10. Typical frost-free season: 119 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~May 28First frost ~Sep 24Frost season at Laketown, UTSpring: a frost after May 10 in 9 years out of 10, after May 28 in half of the years, after June 17 in 1 year out of 10. Fall: the first frost comes before September 11 in 1 year out of 10, before September 24 in half of the years, before October 8 in 9 years out of 10. Typical frost-free season: 119 days.JFMAMJJASONDLast frost ~May 28First frost ~Sep 24
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 29 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)June 17September 11
50% (typical)May 28September 24
90% (likely)May 10October 8
Frost-free season (32°F, 50% chance)
119 days
Hard frost (28°F), last in spring, 50% chance after
May 8
Hard frost (28°F), first in fall, 50% chance before
October 6

The last 15 years (2006–2020 normals)

Typical last frost June 1 (4 days later than the 30-year normal), typical first fall frost September 28 (4 days later). Frost-free season 119 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 Laketown: chance of a frost after this dateSpring, chance of a frost after the date: 10% June 17, 20% June 9, 30% June 5, 40% June 1, 50% May 28, 60% May 23, 70% May 19, 80% May 15, 90% May 10. Observed last spring frost in recent years: 2021 June 11, 2022 June 15, 2023 May 8, 2024 June 18, 2026 May 24.Spring: last frostChance of a frost after this date10%50%90%May 1Jun 1Jul 1Jun 17May 28May 102021: June 112022: June 152023: May 82024: June 182026: May 24Fall at Laketown: chance of a frost before this dateFall, chance of a frost before the date: 10% September 11, 20% September 15, 30% September 18, 40% September 21, 50% September 24, 60% September 27, 70% September 30, 80% October 3, 90% October 8. Observed first fall frost in recent years: 2021 September 19, 2022 October 16, 2023 September 23, 2024 October 1, 2025 October 7.Fall: first frostChance of a frost before this date10%50%90%Sep 1Oct 1Sep 11Sep 24Oct 82021: September 192022: October 162023: September 232024: October 12025: 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
2021June 11September 19
2022June 15October 16
2023May 8September 23
2024June 18October 1
2025incomplete recordOctober 7
2026May 24season not over yet

What these dates mean

June 17 is the cautious spring light-frost date, giving a gardener a 10 % chance that a frost will occur later and allowing tender crops to be set out with relatively low risk.

The 50 % light-frost dates are May 28 in spring and September 24 in fall; each marks a 50 % chance of a frost later (spring) or earlier (fall). The cautious fall date is September 11, when there is only a 10 % chance that a light frost has arrived, so tender crops can be finished harvesting with modest risk. The interval between the two 32 °F 50 % dates spans 119 days, based on 29 years of NOAA records, defining the typical frost-free window for planning.

Hard frosts at 28 °F matter more than light frosts at 32 °F because the lower temperature can kill plant tissue that would survive a light freeze.

How to read the probabilities

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

  • Spring: "10% after June 17" 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 11" 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 Laketown, UTNumbered nearest stations: 1 — near Paris, ID — 21 mi; 2 — near Logan, UT — 25 mi; 3 — Richmond, UT — 26 mi; 4 — Logan Radio Kvnu, UT — 28 mi; 5 — Preston, ID — 34 mi.WYID25 mi · 40 km1. near Paris, ID — 21 mi12. near Logan, UT — 25 mi23. Richmond, UT — 26 mi34. Logan Radio Kvnu, UT — 28 mi45. Preston, ID — 34 mi5
  1. near Paris, ID 21 mi (33 km)
  2. near Logan, UT 25 mi (41 km)
  3. Richmond, UT 26 mi (42 km)
  4. Logan Radio Kvnu, UT 28 mi (46 km)
  5. Preston, ID 34 mi (55 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: 41.8253, -111.3206.