U.S. Frost Dates by Weather Station

NOAA station USC00427064 · Utah

Frost Dates near Provo, UT

NOAA weather station Provo Byu (USC00427064), Utah · elevation 4570 ft (1393 m) · hardiness zone 7a*

Provo is the nearest town to the station (0.9 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 5only 1 spring in 10 still has a frost later
  • Typical last frostApril 1850% chance of a frost after it
  • Typical first fall frostOctober 2150% chance of a frost before it
  • Frost-free season185 daystypical year, 32°F
  • Hardiness zone7acalculated*

The year at a glance

Frost season near Provo, UTSpring: a frost after March 31 in 9 years out of 10, after April 18 in half of the years, after May 5 in 1 year out of 10. Fall: the first frost comes before October 7 in 1 year out of 10, before October 21 in half of the years, before November 4 in 9 years out of 10. Typical frost-free season: 185 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 18First frost ~Oct 21Frost season near Provo, UTSpring: a frost after March 31 in 9 years out of 10, after April 18 in half of the years, after May 5 in 1 year out of 10. Fall: the first frost comes before October 7 in 1 year out of 10, before October 21 in half of the years, before November 4 in 9 years out of 10. Typical frost-free season: 185 days.JFMAMJJASONDLast frost ~Apr 18First frost ~Oct 21
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)May 5October 7
50% (typical)April 18October 21
90% (likely)March 31November 4
Frost-free season (32°F, 50% chance)
185 days
Hard frost (28°F), last in spring, 50% chance after
March 31
Hard frost (28°F), first in fall, 50% chance before
November 1

The last 15 years (2006–2020 normals)

Typical last frost April 19 (1 day later than the 30-year normal), typical first fall frost October 20 (1 day earlier). Frost-free season 182 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 Provo: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 5, 20% April 30, 30% April 25, 40% April 21, 50% April 18, 60% April 15, 70% April 10, 80% April 6, 90% March 31. Observed last spring frost in recent years: 2021 April 7, 2022 May 14, 2023 April 20, 2024 April 30, 2025 April 19, 2026 April 18.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1May 5Apr 18Mar 312021: April 72022: May 142023: April 202024: April 302025: April 192026: April 18Fall near Provo: chance of a frost before this dateFall, chance of a frost before the date: 10% October 7, 20% October 13, 30% October 16, 40% October 18, 50% October 21, 60% October 24, 70% October 27, 80% October 31, 90% November 4. Observed first fall frost in recent years: 2021 October 15, 2022 October 28, 2023 November 1, 2024 November 4, 2025 October 28.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 7Oct 21Nov 42021: October 152022: October 282023: November 12024: November 42025: October 28
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 7October 15
2022May 14October 28
2023April 20November 1
2024April 30November 4
2025April 19October 28
2026April 18season not over yet

What these dates mean

October 7 is the cautious fall date to finish harvesting tender crops in the Provo area, carrying only a 10% chance that a light frost has arrived earlier. The 50% date for light frost in fall is October 21, indicating even odds of a frost occurring before that point. Gardeners can view this median as a benchmark for when frost risk becomes balanced.

The cautious spring date for setting out tender crops is May 5, when there is just a 10% chance of a light frost later in the season; planting before March 31 would be a gamble with a 90% chance of frost. The 50% light-frost date in spring is April 18, marking the midpoint of risk. The 50% hard-frost dates are March 31 in spring and November 1 in fall, and a hard frost matters more because 28 °F can injure plants that survive a light 32 °F frost.

How to read the probabilities

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

  • Spring: "10% after May 5" 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 7" 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 Provo, UTNumbered nearest stations: 1 — Pleasant Grove, UT — 9 mi; 2 — Spanish Fork, UT — 12 mi; 3 — near Midway, UT — 13 mi; 4 — near Santaquin, UT — 21 mi; 5 — Alta, UT — 24 mi.WY25 mi · 40 km1. Pleasant Grove, UT — 9 mi12. Spanish Fork, UT — 12 mi23. near Midway, UT — 13 mi34. near Santaquin, UT — 21 mi45. Alta, UT — 24 mi5
  1. Pleasant Grove, UT 9 mi (15 km)
  2. Spanish Fork, UT 12 mi (19 km)
  3. near Midway, UT 13 mi (20 km)
  4. near Santaquin, UT 21 mi (34 km)
  5. Alta, UT 24 mi (38 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: 40.2458, -111.6508.