U.S. Frost Dates by Weather Station

NOAA station USW00013967 · Oklahoma

Frost Dates near Oklahoma City, OK

NOAA weather station Oklahoma City Will Rogers Airport (USW00013967), Oklahoma · elevation 1285 ft (392 m) · hardiness zone 7b*

Oklahoma City is the nearest town to the station (7.2 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 April 20only 1 spring in 10 still has a frost later
  • Typical last frostApril 450% chance of a frost after it
  • Typical first fall frostNovember 250% chance of a frost before it
  • Frost-free season213 daystypical year, 32°F
  • Hardiness zone7bcalculated*

The year at a glance

Frost season near Oklahoma City, OKSpring: a frost after March 16 in 9 years out of 10, after April 4 in half of the years, after April 20 in 1 year out of 10. Fall: the first frost comes before October 21 in 1 year out of 10, before November 2 in half of the years, before November 17 in 9 years out of 10. Typical frost-free season: 213 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 4First frost ~Nov 2Frost season near Oklahoma City, OKSpring: a frost after March 16 in 9 years out of 10, after April 4 in half of the years, after April 20 in 1 year out of 10. Fall: the first frost comes before October 21 in 1 year out of 10, before November 2 in half of the years, before November 17 in 9 years out of 10. Typical frost-free season: 213 days.JFMAMJJASONDLast frost ~Apr 4First frost ~Nov 2
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 29 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)April 20October 21
50% (typical)April 4November 2
90% (likely)March 16November 17
Frost-free season (32°F, 50% chance)
213 days
Hard frost (28°F), last in spring, 50% chance after
March 21
Hard frost (28°F), first in fall, 50% chance before
November 11

The last 15 years (2006–2020 normals)

Typical last frost April 4 (same as the 30-year normal), typical first fall frost November 2. Frost-free season 213 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 Oklahoma City: chance of a frost after this dateSpring, chance of a frost after the date: 10% April 20, 20% April 15, 30% April 10, 40% April 7, 50% April 4, 60% March 31, 70% March 28, 80% March 22, 90% March 16. Observed last spring frost in recent years: 2021 April 21, 2022 April 9, 2023 March 20, 2024 March 28, 2025 April 7, 2026 March 17.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1Apr 20Apr 4Mar 162021: April 212022: April 92023: March 202024: March 282025: April 72026: March 17Fall near Oklahoma City: chance of a frost before this dateFall, chance of a frost before the date: 10% October 21, 20% October 26, 30% October 29, 40% November 1, 50% November 2, 60% November 5, 70% November 8, 80% November 12, 90% November 17. Observed first fall frost in recent years: 2021 November 12, 2022 October 19, 2023 October 30, 2024 November 26, 2025 October 30.Fall: first frostChance of a frost before this date10%50%90%Nov 1Dec 1Oct 21Nov 2Nov 172021: November 122022: October 192023: October 302024: November 262025: October 30
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 21November 12
2022April 9October 19
2023March 20October 30
2024March 28November 26
2025April 7October 30
2026March 17season not over yet

What these dates mean

The 213 days between the 32°F 50% dates in the Oklahoma City area frame the core growing window. The spring 50% date is April 4, which marks a 50% chance of a light frost later, and the fall 50% date is November 2, indicating a 50% chance of a light frost earlier.

For a cautious planting plan, the spring cautious date is April 20, when there is only a 10% chance of a later light frost, and the fall cautious date is October 21, when there is only a 10% chance that a light frost has arrived earlier.

A hard frost at 28°F matters more than a light frost at 32°F because the lower temperature can damage plant tissue that would otherwise survive a light frost.

How to read the probabilities

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

  • Spring: "10% after April 20" 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 21" 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 Oklahoma City, OKNumbered nearest stations: 1 — Blanchard, OK — 19 mi; 2 — Meeker, OK — 36 mi; 3 — Seminole, OK — 55 mi; 4 — Watonga, OK — 56 mi; 5 — Enid, OK — 73 mi.OK25 mi · 40 km1. Blanchard, OK — 19 mi12. Meeker, OK — 36 mi23. Seminole, OK — 55 mi34. Watonga, OK — 56 mi45. Enid, OK — 73 mi5
  1. Blanchard, OK 19 mi (31 km)
  2. Meeker, OK 36 mi (58 km)
  3. Seminole, OK 55 mi (88 km)
  4. Watonga, OK 56 mi (90 km)
  5. Enid, OK 73 mi (117 km)

Sources

* Hardiness zone 7b: zone derived from PRISM 2023 grid at the station location (not the official USDA map). Source data: PRISM Group, Oregon State University.

Station coordinates: 35.3889, -97.6006.