U.S. Frost Dates by Weather Station

NOAA station USC00344001 · Oklahoma

Frost Dates for Healdton, OK

NOAA weather station Healdton 3 E (USC00344001), Oklahoma · elevation 902 ft (275 m) · hardiness zone 8a*

  • Lower-risk planting dateafter April 25only 1 spring in 10 still has a frost later
  • Typical last frostApril 650% chance of a frost after it
  • Typical first fall frostNovember 150% chance of a frost before it
  • Frost-free season204 daystypical year, 32°F
  • Hardiness zone8acalculated*

The year at a glance

Frost season at Healdton, OKSpring: a frost after March 20 in 9 years out of 10, after April 6 in half of the years, after April 25 in 1 year out of 10. Fall: the first frost comes before October 15 in 1 year out of 10, before November 1 in half of the years, before November 14 in 9 years out of 10. Typical frost-free season: 204 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 6First frost ~Nov 1Frost season at Healdton, OKSpring: a frost after March 20 in 9 years out of 10, after April 6 in half of the years, after April 25 in 1 year out of 10. Fall: the first frost comes before October 15 in 1 year out of 10, before November 1 in half of the years, before November 14 in 9 years out of 10. Typical frost-free season: 204 days.JFMAMJJASONDLast frost ~Apr 6First frost ~Nov 1
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)April 25October 15
50% (typical)April 6November 1
90% (likely)March 20November 14
Frost-free season (32°F, 50% chance)
204 days
Hard frost (28°F), last in spring, 50% chance after
March 28
Hard frost (28°F), first in fall, 50% chance before
November 8

The last 15 years (2006–2020 normals)

Typical last frost April 10 (4 days later than the 30-year normal), typical first fall frost October 28 (4 days earlier). Frost-free season 200 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 Healdton: chance of a frost after this dateSpring, chance of a frost after the date: 10% April 25, 20% April 20, 30% April 14, 40% April 10, 50% April 6, 60% April 3, 70% March 31, 80% March 27, 90% March 20. Observed last spring frost in recent years: 2021 April 22, 2022 April 9, 2023 March 29, 2024 March 28, 2025 April 8.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1Apr 25Apr 6Mar 202021: April 222022: April 92023: March 292024: March 282025: April 8Fall at Healdton: chance of a frost before this dateFall, chance of a frost before the date: 10% October 15, 20% October 21, 30% October 25, 40% October 29, 50% November 1, 60% November 2, 70% November 5, 80% November 9, 90% November 14. Observed first fall frost in recent years: 2021 October 30, 2022 October 18, 2023 October 17, 2024 October 17, 2025 October 30.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 15Nov 1Nov 142021: October 302022: October 182023: October 172024: October 172025: 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 22October 30
2022April 9October 18
2023March 29October 17
2024March 28October 17
2025April 8October 30
2026incomplete recordseason not over yet

What these dates mean

April 25 is the cautious spring light-frost date for Healdton; on that day a gardener can start setting out tender crops with only a 10 % chance of a later frost.

The 50 % dates – April 6 in spring and November 1 in fall – are the median points where a light frost is equally likely to have occurred or not, so they serve as reference markers rather than thresholds. For a cautious autumn schedule the cautious fall date, October 15, marks the point where there is only a 10 % chance that a light frost has already arrived, making it the go-to date to finish harvesting tender crops.

The hard-frost median dates are March 28 in spring and November 8 in fall; a hard frost can damage plants that survive a light frost, so its occurrence is more critical for crop survival.

How to read the probabilities

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

  • Spring: "10% after April 25" 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 Healdton, OKNumbered nearest stations: 1 — Madill, OK — 38 mi; 2 — Gainesville, TX — 46 mi; 3 — Sherman, TX — 58 mi; 4 — Blanchard, OK — 63 mi; 5 — Wichita Falls, TX — 64 mi.OKTX50 mi · 80 km1. Madill, OK — 38 mi12. Gainesville, TX — 46 mi23. Sherman, TX — 58 mi34. Blanchard, OK — 63 mi45. Wichita Falls, TX — 64 mi5
  1. Madill, OK 38 mi (62 km)
  2. Gainesville, TX 46 mi (73 km)
  3. Sherman, TX 58 mi (93 km)
  4. Blanchard, OK 63 mi (101 km)
  5. Wichita Falls, TX 64 mi (103 km)

Sources

* Hardiness zone 8a: zone derived from PRISM 2023 grid at the station location (not the official USDA map). Source data: PRISM Group, Oregon State University.

Station coordinates: 34.2333, -97.4203.