U.S. Frost Dates by Weather Station

NOAA station USC00340755 · Oklahoma

Frost Dates for Billings, OK

NOAA weather station Billings (USC00340755), Oklahoma · elevation 1000 ft (305 m) · hardiness zone 7a*

  • Lower-risk planting dateafter May 1only 1 spring in 10 still has a frost later
  • Typical last frostApril 1550% chance of a frost after it
  • Typical first fall frostOctober 2650% chance of a frost before it
  • Frost-free season194 daystypical year, 32°F
  • Hardiness zone7acalculated*

The year at a glance

Frost season at Billings, OKSpring: a frost after March 29 in 9 years out of 10, after April 15 in half of the years, after May 1 in 1 year out of 10. Fall: the first frost comes before October 12 in 1 year out of 10, before October 26 in half of the years, before November 9 in 9 years out of 10. Typical frost-free season: 194 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 15First frost ~Oct 26Frost season at Billings, OKSpring: a frost after March 29 in 9 years out of 10, after April 15 in half of the years, after May 1 in 1 year out of 10. Fall: the first frost comes before October 12 in 1 year out of 10, before October 26 in half of the years, before November 9 in 9 years out of 10. Typical frost-free season: 194 days.JFMAMJJASONDLast frost ~Apr 15First 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 30 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)May 1October 12
50% (typical)April 15October 26
90% (likely)March 29November 9
Frost-free season (32°F, 50% chance)
194 days
Hard frost (28°F), last in spring, 50% chance after
April 2
Hard frost (28°F), first in fall, 50% chance before
November 4

The last 15 years (2006–2020 normals)

Typical last frost April 16 (1 day later than the 30-year normal), typical first fall frost October 25 (1 day earlier). Frost-free season 193 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 Billings: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 1, 20% April 26, 30% April 22, 40% April 18, 50% April 15, 60% April 11, 70% April 7, 80% April 2, 90% March 29. Observed last spring frost in recent years: 2021 April 21, 2022 April 26, 2023 April 24, 2024 April 4, 2025 April 7, 2026 March 18.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1May 1Apr 15Mar 292021: April 212022: April 262023: April 242024: April 42025: April 72026: March 18Fall at Billings: chance of a frost before this dateFall, chance of a frost before the date: 10% October 12, 20% October 17, 30% October 21, 40% October 23, 50% October 26, 60% October 29, 70% November 1, 80% November 4, 90% November 9. Observed first fall frost in recent years: 2021 October 30, 2022 October 18, 2023 October 7, 2024 October 16, 2025 October 30.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 12Oct 26Nov 92021: October 302022: October 182023: October 72024: October 162025: 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 21October 30
2022April 26October 18
2023April 24October 7
2024April 4October 16
2025April 7October 30
2026March 18season not over yet

What these dates mean

October 12 is the cautious fall date for finishing the harvest of tender crops in Billings. A 10 % chance of a light frost before that day means growers can plan to pull in delicate plants with relatively low risk.

The 50 % dates are April 15 in spring and October 26 in fall; each marks the point where a light frost is equally likely to occur earlier or later. Hard-frost median dates are April 2 and November 4, indicating when temperatures of 28 °F become a realistic possibility.

For a cautious spring plan, May 1 is the date with only a 10 % chance of a light frost later, while October 12 serves the same purpose for fall. A hard frost at 28 °F can damage vegetation more severely than a light frost at 32 °F, so those dates are especially important for protecting tender crops.

How to read the probabilities

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

  • Spring: "10% after May 1" 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 12" 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 Billings, OKNumbered nearest stations: 1 — Ponca City, OK — 24 mi; 2 — Enid, OK — 25 mi; 3 — Ralston, OK — 39 mi; 4 — Helena, OK — 45 mi; 5 — Wellington, KS — 51 mi.25 mi · 40 km1. Ponca City, OK — 24 mi12. Enid, OK — 25 mi23. Ralston, OK — 39 mi34. Helena, OK — 45 mi45. Wellington, KS — 51 mi5
  1. Ponca City, OK 24 mi (38 km)
  2. Enid, OK 25 mi (40 km)
  3. Ralston, OK 39 mi (63 km)
  4. Helena, OK 45 mi (73 km)
  5. Wellington, KS 51 mi (82 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: 36.5297, -97.4472.