U.S. Frost Dates by Weather Station

NOAA station USC00018323 · Alabama

Frost Dates for Troy, AL

NOAA weather station Troy (USC00018323), Alabama · elevation 542 ft (165 m) · hardiness zone 8b*

  • Lower-risk planting dateafter March 30only 1 spring in 10 still has a frost later
  • Typical last frostMarch 1050% chance of a frost after it
  • Typical first fall frostNovember 2150% chance of a frost before it
  • Frost-free season257 daystypical year, 32°F
  • Hardiness zone8bcalculated*

The year at a glance

Frost season at Troy, ALSpring: a frost after February 15 in 9 years out of 10, after March 10 in half of the years, after March 30 in 1 year out of 10. Fall: the first frost comes before November 4 in 1 year out of 10, before November 21 in half of the years, before December 14 in 9 years out of 10. Typical frost-free season: 257 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Mar 10First frost ~Nov 21Frost season at Troy, ALSpring: a frost after February 15 in 9 years out of 10, after March 10 in half of the years, after March 30 in 1 year out of 10. Fall: the first frost comes before November 4 in 1 year out of 10, before November 21 in half of the years, before December 14 in 9 years out of 10. Typical frost-free season: 257 days.JFMAMJJASONDLast frost ~Mar 10First frost ~Nov 21
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 30November 4
50% (typical)March 10November 21
90% (likely)February 15December 14
Frost-free season (32°F, 50% chance)
257 days
Hard frost (28°F), last in spring, 50% chance after
February 24
Hard frost (28°F), first in fall, 50% chance before
December 7

The last 15 years (2006–2020 normals)

Typical last frost March 4 (6 days earlier than the 30-year normal), typical first fall frost November 20 (1 day earlier). Frost-free season 260 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 Troy: chance of a frost after this dateSpring, chance of a frost after the date: 10% March 30, 20% March 23, 30% March 18, 40% March 14, 50% March 10, 60% March 5, 70% March 1, 80% February 23, 90% February 15. Observed last spring frost in recent years: 2021 February 21, 2023 March 21, 2024 February 19, 2026 March 19.Spring: last frostChance of a frost after this date10%50%90%Feb 1Mar 1Apr 1Mar 30Mar 10Feb 152021: February 212023: March 212024: February 192026: March 19Fall at Troy: chance of a frost before this dateFall, chance of a frost before the date: 10% November 4, 20% November 8, 30% November 12, 40% November 17, 50% November 21, 60% November 26, 70% December 1, 80% December 5, 90% December 14. Observed first fall frost in recent years: 2021 January 3, 2022 November 18, 2023 November 29, 2024 November 29, 2025 November 11.Fall: first frostChance of a frost before this date10%50%90%Nov 1Dec 1Jan 1Nov 4Nov 21Dec 142021: January 32022: November 182023: November 292024: November 292025: November 11
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
2021February 21January 3
2022incomplete recordNovember 18
2023March 21November 29
2024February 19November 29
2025incomplete recordNovember 11
2026March 19season not over yet

What these dates mean

March 30 is the cautious spring date in Troy; with only a 10 % chance of a light frost after that day, gardeners can plan to set out tender crops knowing the risk is low.

The 50 % dates, March 10 for spring and November 21 for fall, each represent an even odds point for a light frost—half of the recorded years saw a frost later than March 10 and half saw a frost earlier than November 21. For a conservative schedule, the cautious spring date is March 30 and the cautious fall date is November 4, each carrying a 10 % chance of a light frost that would affect tender crops. The hard-frost median dates are February 24 in spring and December 7 in fall; a hard frost at 28 °F can injure plant tissue that would survive a 32 °F light frost, making it a greater concern.

How to read the probabilities

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

  • Spring: "10% after March 30" 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 November 4" 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 Troy, ALNumbered nearest stations: 1 — Greenville, AL — 37 mi; 2 — Montgomery, AL — 43 mi; 3 — near Geneva, AL — 53 mi; 4 — Evergreen, AL — 63 mi; 5 — Cuthbert, GA — 69 mi.25 mi · 40 km1. Greenville, AL — 37 mi12. Montgomery, AL — 43 mi23. near Geneva, AL — 53 mi34. Evergreen, AL — 63 mi45. Cuthbert, GA — 69 mi5
  1. Greenville, AL 37 mi (60 km)
  2. Montgomery, AL 43 mi (68 km)
  3. near Geneva, AL 53 mi (86 km)
  4. Evergreen, AL 63 mi (101 km)
  5. Cuthbert, GA 69 mi (112 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: 31.8075, -85.9722.