U.S. Frost Dates by Weather Station

NOAA station USW00093986 · Oklahoma

Frost Dates for Hobart, OK

NOAA weather station Hobart Municipal Airport (USW00093986), Oklahoma · elevation 1556 ft (474 m) · hardiness zone 7b*

  • Lower-risk planting dateafter April 21only 1 spring in 10 still has a frost later
  • Typical last frostApril 450% chance of a frost after it
  • Typical first fall frostNovember 450% chance of a frost before it
  • Frost-free season214 daystypical year, 32°F
  • Hardiness zone7bcalculated*

The year at a glance

Frost season at Hobart, OKSpring: a frost after March 15 in 9 years out of 10, after April 4 in half of the years, after April 21 in 1 year out of 10. Fall: the first frost comes before October 22 in 1 year out of 10, before November 4 in half of the years, before November 18 in 9 years out of 10. Typical frost-free season: 214 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 4First frost ~Nov 4Frost season at Hobart, OKSpring: a frost after March 15 in 9 years out of 10, after April 4 in half of the years, after April 21 in 1 year out of 10. Fall: the first frost comes before October 22 in 1 year out of 10, before November 4 in half of the years, before November 18 in 9 years out of 10. Typical frost-free season: 214 days.JFMAMJJASONDLast frost ~Apr 4First frost ~Nov 4
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.Today

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)April 21October 22
50% (typical)April 4November 4
90% (likely)March 15November 18
Frost-free season (32°F, 50% chance)
214 days
Hard frost (28°F), last in spring, 50% chance after
March 21
Hard frost (28°F), first in fall, 50% chance before
November 13

The last 15 years (2006–2020 normals)

Typical last frost April 7 (3 days later than the 30-year normal), typical first fall frost November 5 (1 day later). Frost-free season 212 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 Hobart: chance of a frost after this dateSpring, chance of a frost after the date: 10% April 21, 20% April 16, 30% April 12, 40% April 7, 50% April 4, 60% March 31, 70% March 27, 80% March 22, 90% March 15. Observed last spring frost in recent years: 2021 April 21, 2022 April 14, 2023 April 7, 2024 March 28, 2025 April 7, 2026 March 17.Spring: last frostChance of a frost after this date10%50%90%Mar 1Apr 1May 1Apr 21Apr 4Mar 152021: April 212022: April 142023: April 72024: March 282025: April 72026: March 17Fall at Hobart: chance of a frost before this dateFall, chance of a frost before the date: 10% October 22, 20% October 26, 30% October 30, 40% November 1, 50% November 4, 60% November 7, 70% November 10, 80% November 13, 90% November 18. Observed first fall frost in recent years: 2021 November 13, 2022 November 11, 2023 October 30, 2024 November 26, 2025 October 30.Fall: first frostChance of a frost before this date10%50%90%Nov 1Dec 1Oct 22Nov 4Nov 182021: November 132022: November 112023: 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 13
2022April 14November 11
2023April 7October 30
2024March 28November 26
2025April 7October 30
2026March 17season not over yet

What these dates mean

The 214-day span between the 32 °F 50% dates in Hobart—April 4 in spring and November 4 in fall—covers the central period when light frosts are equally likely to have arrived or not, giving gardeners a clear window for most planting and harvesting activities.

For tender crops, the cautious spring date is April 21, when there is only a 10 % chance of a light frost later, while planting on March 15 carries a 90 % gamble. In the autumn, the cautious date to finish tender crops is October 22, with a 10 % chance that a light frost has already occurred; aiming for November 18 involves a 90 % gamble. The median light-frost dates themselves—April 4 and November 4—represent a 50 % chance of frost either side of the date.

A hard frost at 28 °F, reflected by the median dates March 21 and November 13, can injure or kill plants that would survive a 32 °F light frost, making those dates especially significant for protecting vulnerable crops.

How to read the probabilities

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

  • Spring: "10% after April 21" 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 22" 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 Hobart, OKNumbered nearest stations: 1 — Wellington, TX — 66 mi; 2 — near Shamrock, TX — 69 mi; 3 — Watonga, OK — 70 mi; 4 — Wichita Falls, TX — 77 mi; 5 — Blanchard, OK — 79 mi.OKTX50 mi · 80 km1. Wellington, TX — 66 mi12. near Shamrock, TX — 69 mi23. Watonga, OK — 70 mi34. Wichita Falls, TX — 77 mi45. Blanchard, OK — 79 mi5
  1. Wellington, TX 66 mi (107 km)
  2. near Shamrock, TX 69 mi (112 km)
  3. Watonga, OK 70 mi (113 km)
  4. Wichita Falls, TX 77 mi (124 km)
  5. Blanchard, OK 79 mi (127 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: 34.9894, -99.0525.