U.S. Frost Dates by Weather Station

NOAA station USC00346139 · Oklahoma

Frost Dates for Mutual, OK

NOAA weather station Mutual (USC00346139), Oklahoma · elevation 1890 ft (576 m) · hardiness zone 7a*

  • Lower-risk planting dateafter May 3only 1 spring in 10 still has a frost later
  • Typical last frostApril 1950% chance of a frost after it
  • Typical first fall frostOctober 2650% chance of a frost before it
  • Frost-free season188 daystypical year, 32°F
  • Hardiness zone7acalculated*

The year at a glance

Frost season at Mutual, OKSpring: a frost after April 1 in 9 years out of 10, after April 19 in half of the years, after May 3 in 1 year out of 10. Fall: the first frost comes before October 11 in 1 year out of 10, before October 26 in half of the years, before November 8 in 9 years out of 10. Typical frost-free season: 188 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 19First frost ~Oct 26Frost season at Mutual, OKSpring: a frost after April 1 in 9 years out of 10, after April 19 in half of the years, after May 3 in 1 year out of 10. Fall: the first frost comes before October 11 in 1 year out of 10, before October 26 in half of the years, before November 8 in 9 years out of 10. Typical frost-free season: 188 days.JFMAMJJASONDLast frost ~Apr 19First frost ~Oct 26
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 28 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)May 3October 11
50% (typical)April 19October 26
90% (likely)April 1November 8
Frost-free season (32°F, 50% chance)
188 days
Hard frost (28°F), last in spring, 50% chance after
April 7
Hard frost (28°F), first in fall, 50% chance before
November 2

The last 15 years (2006–2020 normals)

Typical last frost April 19 (same as the 30-year normal), typical first fall frost October 26. Frost-free season 188 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 Mutual: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 3, 20% April 29, 30% April 25, 40% April 22, 50% April 19, 60% April 16, 70% April 13, 80% April 9, 90% April 1. Observed last spring frost in recent years: 2021 April 22.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1May 3Apr 19Apr 12021: April 22Fall at Mutual: chance of a frost before this dateFall, chance of a frost before the date: 10% October 11, 20% October 17, 30% October 20, 40% October 23, 50% October 26, 60% October 28, 70% November 1, 80% November 4, 90% November 8. Observed first fall frost in recent years: 2021 November 13.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 11Oct 26Nov 82021: November 13
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 22November 13
2022no datano data
2023no datano data
2024no datano data
2025no datano data
2026no dataseason not over yet

What these dates mean

The cautious fall date for finishing the harvest in Mutual is October 11, when there is only a 10 % chance a light frost has arrived. After that date the risk of frost that can affect tender crops rises sharply.

April 19 is the 50 % date for light frost in spring, indicating an even chance of frost during the remainder of the season, while October 26 is the 50 % date for light frost in fall, giving an even chance that a frost has already occurred by that time. The 50 % hard-frost dates are April 7 and November 2; a hard frost at 28 °F can damage plant tissue that survives a light frost at 32 °F, so it matters more.

A cautious planting plan uses the May 3 light-frost date, with a 10 % chance of frost later, for tender crops in spring, and the October 11 date for ending the tender-crop harvest in fall.

How to read the probabilities

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

  • Spring: "10% after May 3" 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 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 Mutual, OKNumbered nearest stations: 1 — Gage, OK — 34 mi; 2 — Watonga, OK — 49 mi; 3 — Helena, OK — 55 mi; 4 — Lipscomb, TX — 61 mi; 5 — Gate, OK — 65 mi.OKTX25 mi · 40 km1. Gage, OK — 34 mi12. Watonga, OK — 49 mi23. Helena, OK — 55 mi34. Lipscomb, TX — 61 mi45. Gate, OK — 65 mi5
  1. Gage, OK 34 mi (54 km)
  2. Watonga, OK 49 mi (79 km)
  3. Helena, OK 55 mi (88 km)
  4. Lipscomb, TX 61 mi (99 km)
  5. Gate, OK 65 mi (105 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: 36.2283, -99.17.