U.S. Frost Dates by Weather Station

NOAA station USC00031962 · Arkansas

Frost Dates for Dermott, AR

NOAA weather station Dermott 3 NE (USC00031962), Arkansas · elevation 145 ft (44 m) · hardiness zone 8b*

  • Lower-risk planting dateafter March 31only 1 spring in 10 still has a frost later
  • Typical last frostMarch 1350% chance of a frost after it
  • Typical first fall frostNovember 1050% chance of a frost before it
  • Frost-free season242 daystypical year, 32°F
  • Hardiness zone8bcalculated*

The year at a glance

Frost season at Dermott, ARSpring: a frost after February 23 in 9 years out of 10, after March 13 in half of the years, after March 31 in 1 year out of 10. Fall: the first frost comes before October 25 in 1 year out of 10, before November 10 in half of the years, before November 30 in 9 years out of 10. Typical frost-free season: 242 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Mar 13First frost ~Nov 10Frost season at Dermott, ARSpring: a frost after February 23 in 9 years out of 10, after March 13 in half of the years, after March 31 in 1 year out of 10. Fall: the first frost comes before October 25 in 1 year out of 10, before November 10 in half of the years, before November 30 in 9 years out of 10. Typical frost-free season: 242 days.JFMAMJJASONDLast frost ~Mar 13First frost ~Nov 10
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 26 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)March 31October 25
50% (typical)March 13November 10
90% (likely)February 23November 30
Frost-free season (32°F, 50% chance)
242 days
Hard frost (28°F), last in spring, 50% chance after
February 28
Hard frost (28°F), first in fall, 50% chance before
November 23

The last 15 years (2006–2020 normals)

Typical last frost March 11 (2 days earlier than the 30-year normal), typical first fall frost November 10. Frost-free season 245 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 Dermott: chance of a frost after this dateSpring, chance of a frost after the date: 10% March 31, 20% March 25, 30% March 20, 40% March 17, 50% March 13, 60% March 9, 70% March 5, 80% February 28, 90% February 23.Spring: last frostChance of a frost after this date10%50%90%Mar 1Apr 1Mar 31Mar 13Feb 23Fall at Dermott: chance of a frost before this dateFall, chance of a frost before the date: 10% October 25, 20% October 31, 30% November 3, 40% November 6, 50% November 10, 60% November 14, 70% November 18, 80% November 23, 90% November 30.Fall: first frostChance of a frost before this date10%50%90%Nov 1Dec 1Oct 25Nov 10Nov 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.

What these dates mean

March 31 is the cautious spring date in Dermott, marking a 10 % chance that a light frost will occur later; this allows a gardener to plan the outdoor placement of tender crops with a low risk of damage. Planting before February 23 would be a gamble, as that date carries a 90 % chance of a later frost.

The 50 % date in spring is March 13, meaning there is a 50 % chance of a light frost later than this date, while the 50 % date in fall is November 10, meaning there is a 50 % chance of a light frost earlier than this date. For a cautious fall schedule, October 25 is used, as it has only a 10 % chance that a frost has already arrived, giving a gardener a low-risk window to finish harvesting tender crops.

A hard frost at 28 °F matters more than a light frost at 32 °F because plant tissue that can survive the milder temperature may still be damaged by the colder one; the median hard-frost dates are February 28 in spring and November 23 in fall.

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 25" 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 Dermott, ARNumbered nearest stations: 1 — Rohwer, AR — 18 mi; 2 — Monticello, AR — 22 mi; 3 — Portland, AR — 22 mi; 4 — Arkansas Post, AR — 32 mi; 5 — Crossett, AR — 45 mi.ARMS25 mi · 40 km1. Rohwer, AR — 18 mi12. Monticello, AR — 22 mi23. Portland, AR — 22 mi34. Arkansas Post, AR — 32 mi45. Crossett, AR — 45 mi5
  1. Rohwer, AR 18 mi (30 km)
  2. Monticello, AR 22 mi (35 km)
  3. Portland, AR 22 mi (36 km)
  4. Arkansas Post, AR 32 mi (52 km)
  5. Crossett, AR 45 mi (72 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: 33.5597, -91.385.