U.S. Frost Dates by Weather Station

NOAA station USC00341828 · Oklahoma

Frost Dates for Claremore, OK

NOAA weather station Claremore 2 ENE (USC00341828), Oklahoma · elevation 588 ft (179 m) · hardiness zone 7a*

  • Lower-risk planting dateafter April 24only 1 spring in 10 still has a frost later
  • Typical last frostApril 750% chance of a frost after it
  • Typical first fall frostOctober 3050% chance of a frost before it
  • Frost-free season205 daystypical year, 32°F
  • Hardiness zone7acalculated*

The year at a glance

Frost season at Claremore, OKSpring: a frost after March 20 in 9 years out of 10, after April 7 in half of the years, after April 24 in 1 year out of 10. Fall: the first frost comes before October 15 in 1 year out of 10, before October 30 in half of the years, before November 13 in 9 years out of 10. Typical frost-free season: 205 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 7First frost ~Oct 30Frost season at Claremore, OKSpring: a frost after March 20 in 9 years out of 10, after April 7 in half of the years, after April 24 in 1 year out of 10. Fall: the first frost comes before October 15 in 1 year out of 10, before October 30 in half of the years, before November 13 in 9 years out of 10. Typical frost-free season: 205 days.JFMAMJJASONDLast frost ~Apr 7First frost ~Oct 30
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 27 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)April 24October 15
50% (typical)April 7October 30
90% (likely)March 20November 13
Frost-free season (32°F, 50% chance)
205 days
Hard frost (28°F), last in spring, 50% chance after
March 25
Hard frost (28°F), first in fall, 50% chance before
November 8

The last 15 years (2006–2020 normals)

Typical last frost April 7 (same as the 30-year normal), typical first fall frost October 30. Frost-free season 206 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 Claremore: chance of a frost after this dateSpring, chance of a frost after the date: 10% April 24, 20% April 18, 30% April 14, 40% April 10, 50% April 7, 60% April 3, 70% March 31, 80% March 27, 90% March 20.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1Apr 24Apr 7Mar 20Fall at Claremore: chance of a frost before this dateFall, chance of a frost before the date: 10% October 15, 20% October 20, 30% October 24, 40% October 28, 50% October 30, 60% November 1, 70% November 4, 80% November 8, 90% November 13.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 15Oct 30Nov 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.

What these dates mean

The 205 days between the 50% dates in Claremore frame the window in which a light frost (32 °F) is equally likely to occur, with the 50% date of April 7 and the 50% date of October 30. During this span a gardener can expect roughly equal odds of a frost before or after each median date.

For tender crops the cautious spring date is April 24, when there is only a 10 % chance of a frost later; planting earlier on March 20 carries a 90 % chance of frost and is a gamble. In the fall the cautious date is October 15, with only a 10 % chance that a frost has already arrived, while waiting until November 13 raises the risk to 90 %.

A hard frost at 28 °F—where the 50% hard-frost date is March 25 in spring and the 50% hard-frost date is November 8 in fall—poses a greater threat to plant tissue than a light frost, because the lower temperature can cause damage even to species that tolerate 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 April 24" 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 15" 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 Claremore, OKNumbered nearest stations: 1 — Tulsa, OK — 19 mi; 2 — near Bartlesville, OK — 39 mi; 3 — Mound Valley, KS — 60 mi; 4 — Gravette, AR — 63 mi; 5 — Independence, KS — 63 mi.OKMOAR25 mi · 40 km1. Tulsa, OK — 19 mi12. near Bartlesville, OK — 39 mi23. Mound Valley, KS — 60 mi34. Gravette, AR — 63 mi45. Independence, KS — 63 mi5
  1. Tulsa, OK 19 mi (31 km)
  2. near Bartlesville, OK 39 mi (64 km)
  3. Mound Valley, KS 60 mi (97 km)
  4. Gravette, AR 63 mi (102 km)
  5. Independence, KS 63 mi (102 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: 36.3225, -95.5808.