U.S. Frost Dates by Weather Station

NOAA station USC00426919 · Utah

Frost Dates for Pleasant Grove, UT

NOAA weather station Pleasant Grove (USC00426919), Utah · elevation 4692 ft (1430 m) · hardiness zone 7a*

  • Lower-risk planting dateafter May 7only 1 spring in 10 still has a frost later
  • Typical last frostApril 1750% chance of a frost after it
  • Typical first fall frostOctober 2550% chance of a frost before it
  • Frost-free season188 daystypical year, 32°F
  • Hardiness zone7acalculated*

The year at a glance

Frost season at Pleasant Grove, UTSpring: a frost after March 30 in 9 years out of 10, after April 17 in half of the years, after May 7 in 1 year out of 10. Fall: the first frost comes before October 10 in 1 year out of 10, before October 25 in half of the years, before November 8 in 9 years out of 10. Typical frost-free season: 188 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 17First frost ~Oct 25Frost season at Pleasant Grove, UTSpring: a frost after March 30 in 9 years out of 10, after April 17 in half of the years, after May 7 in 1 year out of 10. Fall: the first frost comes before October 10 in 1 year out of 10, before October 25 in half of the years, before November 8 in 9 years out of 10. Typical frost-free season: 188 days.JFMAMJJASONDLast frost ~Apr 17First frost ~Oct 25
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.Today

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 7October 10
50% (typical)April 17October 25
90% (likely)March 30November 8
Frost-free season (32°F, 50% chance)
188 days
Hard frost (28°F), last in spring, 50% chance after
March 30
Hard frost (28°F), first in fall, 50% chance before
November 5

The last 15 years (2006–2020 normals)

Typical last frost April 18 (1 day later than the 30-year normal), typical first fall frost October 23 (2 days earlier). Frost-free season 187 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 Pleasant Grove: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 7, 20% April 30, 30% April 26, 40% April 22, 50% April 17, 60% April 13, 70% April 9, 80% April 5, 90% March 30. Observed last spring frost in recent years: 2021 April 12, 2022 April 14, 2023 April 16, 2024 May 2, 2026 April 18.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1May 7Apr 17Mar 302021: April 122022: April 142023: April 162024: May 22026: April 18Fall at Pleasant Grove: chance of a frost before this dateFall, chance of a frost before the date: 10% October 10, 20% October 16, 30% October 19, 40% October 22, 50% October 25, 60% October 28, 70% October 31, 80% November 4, 90% November 8. Observed first fall frost in recent years: 2021 October 13, 2022 October 23, 2023 October 26, 2024 November 1, 2025 October 21.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 10Oct 25Nov 82021: October 132022: October 232023: October 262024: November 12025: 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 12October 13
2022April 14October 23
2023April 16October 26
2024May 2November 1
2025incomplete recordOctober 21
2026April 18season not over yet

What these dates mean

May 7 is the cautious spring date, giving a gardener a 10 % chance of a light frost later and marking a reliable time to set out tender crops.

The 50% date is April 17; there is an even chance of a light frost occurring later. For the fall, October 10 is the cautious date, with only a 10 % chance that a light frost has arrived earlier, making it a good point to finish harvesting tender crops. The 50% date is October 25; there is an even chance of a light frost occurring earlier.

Hard-frost thresholds are lower; the 50% hard-frost date is March 30 in spring and November 5 in fall. Because 28 °F freezes plant tissue more deeply than 32 °F, hard frosts pose a greater risk to tender crops than light frosts.

How to read the probabilities

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

  • Spring: "10% after May 7" 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 10" 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 Pleasant Grove, UTNumbered nearest stations: 1 — near Provo, UT — 9 mi; 2 — near Midway, UT — 11 mi; 3 — Alta, UT — 16 mi; 4 — Cottonwood Weir, UT — 18 mi; 5 — Spanish Fork, UT — 21 mi.WY25 mi · 40 km1. near Provo, UT — 9 mi12. near Midway, UT — 11 mi23. Alta, UT — 16 mi34. Cottonwood Weir, UT — 18 mi45. Spanish Fork, UT — 21 mi5
  1. near Provo, UT 9 mi (15 km)
  2. near Midway, UT 11 mi (18 km)
  3. Alta, UT 16 mi (26 km)
  4. Cottonwood Weir, UT 18 mi (28 km)
  5. Spanish Fork, UT 21 mi (34 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: 40.3678, -111.7333.