U.S. Frost Dates by Weather Station

NOAA station USC00424508 · Utah

Frost Dates for Kanab, UT

NOAA weather station Kanab (USC00424508), Utah · elevation 4900 ft (1494 m) · hardiness zone 7a*

  • Lower-risk planting dateafter May 18only 1 spring in 10 still has a frost later
  • Typical last frostApril 2950% chance of a frost after it
  • Typical first fall frostOctober 2250% chance of a frost before it
  • Frost-free season175 daystypical year, 32°F
  • Hardiness zone7acalculated*

The year at a glance

Frost season at Kanab, UTSpring: a frost after April 12 in 9 years out of 10, after April 29 in half of the years, after May 18 in 1 year out of 10. Fall: the first frost comes before October 6 in 1 year out of 10, before October 22 in half of the years, before November 5 in 9 years out of 10. Typical frost-free season: 175 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 29First frost ~Oct 22Frost season at Kanab, UTSpring: a frost after April 12 in 9 years out of 10, after April 29 in half of the years, after May 18 in 1 year out of 10. Fall: the first frost comes before October 6 in 1 year out of 10, before October 22 in half of the years, before November 5 in 9 years out of 10. Typical frost-free season: 175 days.JFMAMJJASONDLast frost ~Apr 29First frost ~Oct 22
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 26 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)May 18October 6
50% (typical)April 29October 22
90% (likely)April 12November 5
Frost-free season (32°F, 50% chance)
175 days
Hard frost (28°F), last in spring, 50% chance after
April 11
Hard frost (28°F), first in fall, 50% chance before
November 2

The last 15 years (2006–2020 normals)

Typical last frost April 28 (1 day earlier than the 30-year normal), typical first fall frost October 21 (1 day earlier). Frost-free season 176 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 Kanab: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 18, 20% May 12, 30% May 5, 40% May 1, 50% April 29, 60% April 25, 70% April 22, 80% April 18, 90% April 12. Observed last spring frost in recent years: 2021 April 21, 2022 May 12, 2023 April 20, 2024 May 6, 2025 April 28, 2026 April 18.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1Jun 1May 18Apr 29Apr 122021: April 212022: May 122023: April 202024: May 62025: April 282026: April 18Fall at Kanab: chance of a frost before this dateFall, chance of a frost before the date: 10% October 6, 20% October 12, 30% October 16, 40% October 19, 50% October 22, 60% October 26, 70% October 29, 80% November 1, 90% November 5. Observed first fall frost in recent years: 2021 October 6, 2022 October 24, 2023 October 29, 2024 October 30, 2025 October 16.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 6Oct 22Nov 52021: October 62022: October 242023: October 292024: October 302025: October 16
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 6
2022May 12October 24
2023April 20October 29
2024May 6October 30
2025April 28October 16
2026April 18season not over yet

What these dates mean

May 18 is the cautious spring light-frost date for Kanab, giving a gardener a 10 % chance of any frost later and allowing tender crops to be set out with minimal risk. The median light-frost date in spring is April 29, indicating an even chance of frost on either side, while the risky early date of April 12 carries a 90 % chance of frost later.

In the fall the cautious light-frost date is October 6, when only a 10 % chance of frost has already arrived, so harvesting tender crops can be finished with confidence. The median fall light-frost date is October 22, and the risky late date of November 5 carries a 90 % chance of frost earlier. The 50 % hard-frost dates are April 11 in spring and November 2 in fall; a hard frost at 28 °F can damage plant tissue that survives 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 18" 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 6" 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 Kanab, UTNumbered nearest stations: 1 — Pipe Spring National Monument, AZ — 16 mi; 2 — Zion National Park, UT — 28 mi; 3 — Alton, UT — 29 mi; 4 — Bryce Canyon National Park Headquarters, UT — 47 mi; 5 — New Harmony, UT — 51 mi.UTNV25 mi · 40 km1. Pipe Spring National Monument, AZ — 16 mi12. Zion National Park, UT — 28 mi23. Alton, UT — 29 mi34. Bryce Canyon National Park Headquarters, UT — 47 mi45. New Harmony, UT — 51 mi5
  1. Pipe Spring National Monument, AZ 16 mi (26 km)
  2. Zion National Park, UT 28 mi (44 km)
  3. Alton, UT 29 mi (46 km)
  4. Bryce Canyon National Park Headquarters, UT 47 mi (75 km)
  5. New Harmony, UT 51 mi (82 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: 37.0286, -112.5361.