U.S. Frost Dates by Weather Station

NOAA station USC00425186 · Utah

Frost Dates near Logan, UT

NOAA weather station Logan Utah State University (USC00425186), Utah · elevation 4790 ft (1460 m) · hardiness zone 6a*

Logan is the nearest town to the station (1.7 mi away) in GeoNames (CC BY 4.0). The dates below are measured at the station, not in the town itself.

  • Lower-risk planting dateafter May 19only 1 spring in 10 still has a frost later
  • Typical last frostApril 3050% chance of a frost after it
  • Typical first fall frostOctober 1650% chance of a frost before it
  • Frost-free season166 daystypical year, 32°F
  • Hardiness zone6acalculated*

The year at a glance

Frost season near Logan, UTSpring: a frost after April 14 in 9 years out of 10, after April 30 in half of the years, after May 19 in 1 year out of 10. Fall: the first frost comes before October 1 in 1 year out of 10, before October 16 in half of the years, before October 29 in 9 years out of 10. Typical frost-free season: 166 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 30First frost ~Oct 16Frost season near Logan, UTSpring: a frost after April 14 in 9 years out of 10, after April 30 in half of the years, after May 19 in 1 year out of 10. Fall: the first frost comes before October 1 in 1 year out of 10, before October 16 in half of the years, before October 29 in 9 years out of 10. Typical frost-free season: 166 days.JFMAMJJASONDLast frost ~Apr 30First frost ~Oct 16
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 25 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)May 19October 1
50% (typical)April 30October 16
90% (likely)April 14October 29
Frost-free season (32°F, 50% chance)
166 days
Hard frost (28°F), last in spring, 50% chance after
April 15
Hard frost (28°F), first in fall, 50% chance before
October 27

The last 15 years (2006–2020 normals)

Typical last frost May 1 (1 day later than the 30-year normal), typical first fall frost October 18 (2 days later). Frost-free season 169 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 near Logan: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 19, 20% May 11, 30% May 6, 40% May 2, 50% April 30, 60% April 26, 70% April 22, 80% April 19, 90% April 14. Observed last spring frost in recent years: 2021 April 21, 2022 May 11, 2023 April 23, 2024 May 8, 2025 April 19, 2026 April 27.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1Jun 1May 19Apr 30Apr 142021: April 212022: May 112023: April 232024: May 82025: April 192026: April 27Fall near Logan: chance of a frost before this dateFall, chance of a frost before the date: 10% October 1, 20% October 6, 30% October 10, 40% October 13, 50% October 16, 60% October 19, 70% October 22, 80% October 25, 90% October 29. Observed first fall frost in recent years: 2021 October 12, 2022 October 23, 2023 October 26, 2024 October 19, 2025 October 21.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 1Oct 16Oct 292021: October 122022: October 232023: October 262024: October 192025: October 21
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
2021April 21October 12
2022May 11October 23
2023April 23October 26
2024May 8October 19
2025April 19October 21
2026April 27season not over yet

What these dates mean

May 19 is the cautious spring light-frost date in the Logan area; with only a 10 % chance of a frost later, a gardener can plan to set out tender crops after that day. By contrast, April 14 carries a 90 % chance of a later frost, so planting then would be a gamble. The 50 % date is April 30, a 50 % chance of a frost later, and October 16 marks the 50 % chance of a frost earlier in fall; these dates simply describe the point at which frost risk is even.

The cautious fall date is October 1, when there is only a 10 % chance that a frost has already arrived, making it a reliable day to finish harvesting tender crops. Hard-frost risk is indicated by the 50 % dates of April 15 in spring and October 27 in fall; a 28 °F frost damages plants more severely than a 32 °F light frost, so those dates are important for protecting sensitive growth. The record spans 25 years, and the interval between the two 32 °F 50 % dates is 166 days.

How to read the probabilities

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

  • Spring: "10% after May 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 October 1" 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 Logan, UTNumbered nearest stations: 1 — Logan Radio Kvnu, UT — 3 mi; 2 — Richmond, UT — 11 mi; 3 — near Garland, UT — 14 mi; 4 — Brigham City, UT — 20 mi; 5 — Preston, ID — 24 mi.UTIDWY25 mi · 40 km1. Logan Radio Kvnu, UT — 3 mi12. Richmond, UT — 11 mi23. near Garland, UT — 14 mi34. Brigham City, UT — 20 mi45. Preston, ID — 24 mi5
  1. Logan Radio Kvnu, UT 3 mi (5 km)
  2. Richmond, UT 11 mi (18 km)
  3. near Garland, UT 14 mi (23 km)
  4. Brigham City, UT 20 mi (32 km)
  5. Preston, ID 24 mi (39 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: 41.7456, -111.8033.