U.S. Frost Dates by Weather Station

NOAA station USC00036253 · Arkansas

Frost Dates for Rohwer, AR

NOAA weather station Rohwer 2 NNE (USC00036253), Arkansas · elevation 150 ft (46 m) · hardiness zone 8b*

  • Lower-risk planting dateafter March 31only 1 spring in 10 still has a frost later
  • Typical last frostMarch 1250% chance of a frost after it
  • Typical first fall frostNovember 1450% chance of a frost before it
  • Frost-free season247 daystypical year, 32°F
  • Hardiness zone8bcalculated*

The year at a glance

Frost season at Rohwer, ARSpring: a frost after February 21 in 9 years out of 10, after March 12 in half of the years, after March 31 in 1 year out of 10. Fall: the first frost comes before October 29 in 1 year out of 10, before November 14 in half of the years, before December 3 in 9 years out of 10. Typical frost-free season: 247 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Mar 12First frost ~Nov 14Frost season at Rohwer, ARSpring: a frost after February 21 in 9 years out of 10, after March 12 in half of the years, after March 31 in 1 year out of 10. Fall: the first frost comes before October 29 in 1 year out of 10, before November 14 in half of the years, before December 3 in 9 years out of 10. Typical frost-free season: 247 days.JFMAMJJASONDLast frost ~Mar 12First frost ~Nov 14
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)March 31October 29
50% (typical)March 12November 14
90% (likely)February 21December 3
Frost-free season (32°F, 50% chance)
247 days
Hard frost (28°F), last in spring, 50% chance after
February 28
Hard frost (28°F), first in fall, 50% chance before
November 28

The last 15 years (2006–2020 normals)

Typical last frost March 10 (2 days earlier than the 30-year normal), typical first fall frost November 15 (1 day later). Frost-free season 250 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 Rohwer: chance of a frost after this dateSpring, chance of a frost after the date: 10% March 31, 20% March 24, 30% March 19, 40% March 15, 50% March 12, 60% March 8, 70% March 4, 80% February 28, 90% February 21. Observed last spring frost in recent years: 2025 February 25.Spring: last frostChance of a frost after this date10%50%90%Mar 1Apr 1Mar 31Mar 12Feb 212025: February 25Fall at Rohwer: chance of a frost before this dateFall, chance of a frost before the date: 10% October 29, 20% November 2, 30% November 6, 40% November 10, 50% November 14, 60% November 18, 70% November 22, 80% November 28, 90% December 3. Observed first fall frost in recent years: 2021 November 19, 2025 November 9.Fall: first frostChance of a frost before this date10%50%90%Nov 1Dec 1Oct 29Nov 14Dec 32021: November 192025: November 9
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
2021incomplete recordNovember 19
2022incomplete recordincomplete record
2023incomplete recordincomplete record
2024incomplete recordincomplete record
2025February 25November 9
2026incomplete recordseason not over yet

What these dates mean

March 31 is the cautious spring date for Rohwer, and it marks the point when a gardener can set out tender crops with only a 10 % chance of a light frost later.

The 50 % date is March 12, signifying an even chance of a light frost occurring after that day, while the 50 % date is November 14, indicating an even chance of a light frost occurring earlier than that day. For hard frost, the median dates are February 28 in spring and November 28 in fall; a hard frost at 28 °F can cause more severe damage than a light frost at 32 °F.

October 29 is the cautious fall date, giving a gardener a 10 % chance that a light frost has arrived earlier and allowing the finishing of tender-crop harvests.

How to read the probabilities

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

  • Spring: "10% after March 31" 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 29" 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 Rohwer, ARNumbered nearest stations: 1 — Arkansas Post, AR — 15 mi; 2 — Dermott, AR — 18 mi; 3 — Monticello, AR — 30 mi; 4 — Portland, AR — 41 mi; 5 — Pine Bluff (Grider Field), AR — 45 mi.ARMS25 mi · 40 km1. Arkansas Post, AR — 15 mi12. Dermott, AR — 18 mi23. Monticello, AR — 30 mi34. Portland, AR — 41 mi45. Pine Bluff (Grider Field), AR — 45 mi5
  1. Arkansas Post, AR 15 mi (25 km)
  2. Dermott, AR 18 mi (30 km)
  3. Monticello, AR 30 mi (48 km)
  4. Portland, AR 41 mi (66 km)
  5. Pine Bluff (Grider Field), AR 45 mi (73 km)

Sources

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

Station coordinates: 33.8103, -91.2778.