U.S. Frost Dates by Weather Station

NOAA station USC00409155 · Tennessee

Frost Dates for Tullahoma, TN

NOAA weather station Tullahoma (USC00409155), Tennessee · elevation 1022 ft (312 m) · hardiness zone 7b*

  • Lower-risk planting dateafter April 23only 1 spring in 10 still has a frost later
  • Typical last frostApril 650% chance of a frost after it
  • Typical first fall frostOctober 3050% chance of a frost before it
  • Frost-free season207 daystypical year, 32°F
  • Hardiness zone7bcalculated*

The year at a glance

Frost season at Tullahoma, TNSpring: a frost after March 21 in 9 years out of 10, after April 6 in half of the years, after April 23 in 1 year out of 10. Fall: the first frost comes before October 18 in 1 year out of 10, before October 30 in half of the years, before November 12 in 9 years out of 10. Typical frost-free season: 207 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 6First frost ~Oct 30Frost season at Tullahoma, TNSpring: a frost after March 21 in 9 years out of 10, after April 6 in half of the years, after April 23 in 1 year out of 10. Fall: the first frost comes before October 18 in 1 year out of 10, before October 30 in half of the years, before November 12 in 9 years out of 10. Typical frost-free season: 207 days.JFMAMJJASONDLast frost ~Apr 6First frost ~Oct 30
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 30 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)April 23October 18
50% (typical)April 6October 30
90% (likely)March 21November 12
Frost-free season (32°F, 50% chance)
207 days
Hard frost (28°F), last in spring, 50% chance after
March 26
Hard frost (28°F), first in fall, 50% chance before
November 8

The last 15 years (2006–2020 normals)

Typical last frost April 7 (1 day later than the 30-year normal), typical first fall frost October 31 (1 day later). Frost-free season 208 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 Tullahoma: chance of a frost after this dateSpring, chance of a frost after the date: 10% April 23, 20% April 18, 30% April 13, 40% April 9, 50% April 6, 60% April 3, 70% March 31, 80% March 28, 90% March 21. Observed last spring frost in recent years: 2021 April 22, 2022 April 10, 2023 March 29, 2024 April 6, 2025 April 9, 2026 March 18.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1Apr 23Apr 6Mar 212021: April 222022: April 102023: March 292024: April 62025: April 92026: March 18Fall at Tullahoma: chance of a frost before this dateFall, chance of a frost before the date: 10% October 18, 20% October 21, 30% October 25, 40% October 27, 50% October 30, 60% November 1, 70% November 3, 80% November 6, 90% November 12. Observed first fall frost in recent years: 2021 November 5, 2022 October 18, 2023 November 1, 2024 November 24, 2025 November 10.Fall: first frostChance of a frost before this date10%50%90%Nov 1Dec 1Oct 18Oct 30Nov 122021: November 52022: October 182023: November 12024: November 242025: November 10
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 22November 5
2022April 10October 18
2023March 29November 1
2024April 6November 24
2025April 9November 10
2026March 18season not over yet

What these dates mean

October 18 is the cautious fall date in Tullahoma for finishing the harvest of tender crops. It carries only a 10 % chance that a light frost has already arrived, so growers can plan to wrap up sensitive work by then. The spring cautious date for setting out tender crops is April 23, which has a 10 % chance of a light frost occurring later than then.

At the 50 % light-frost dates, a gardener faces an even odds of frost. The 50 % date in spring is April 6; there is a 50 % chance of a light frost later than this date. The 50 % date in fall is October 30; there is a 50 % chance of a light frost earlier than this date. The 50 % hard-frost dates are March 26 in spring and November 8 in fall.

A hard frost at 28 °F can damage plants that survive a light frost at 32 °F, making it a more critical threshold.

How to read the probabilities

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

  • Spring: "10% after April 23" 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 18" 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 Tullahoma, TNNumbered nearest stations: 1 — near Shelbyville, TN — 18 mi; 2 — Monteagle, TN — 22 mi; 3 — Fayetteville, TN — 24 mi; 4 — McMinnville, TN — 33 mi; 5 — Lewisburg, TN — 34 mi.TNGA25 mi · 40 km1. near Shelbyville, TN — 18 mi12. Monteagle, TN — 22 mi23. Fayetteville, TN — 24 mi34. McMinnville, TN — 33 mi45. Lewisburg, TN — 34 mi5
  1. near Shelbyville, TN 18 mi (29 km)
  2. Monteagle, TN 22 mi (36 km)
  3. Fayetteville, TN 24 mi (38 km)
  4. McMinnville, TN 33 mi (53 km)
  5. Lewisburg, TN 34 mi (55 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: 35.3453, -86.2089.