U.S. Frost Dates by Weather Station

NOAA station USC00405187 · Tennessee

Frost Dates for Lewisburg, TN

NOAA weather station Lewisburg Experiment Station (USC00405187), Tennessee · elevation 787 ft (240 m) · hardiness zone 7b*

  • Lower-risk planting dateafter April 30only 1 spring in 10 still has a frost later
  • Typical last frostApril 1450% chance of a frost after it
  • Typical first fall frostOctober 2250% chance of a frost before it
  • Frost-free season192 daystypical year, 32°F
  • Hardiness zone7bcalculated*

The year at a glance

Frost season at Lewisburg, TNSpring: a frost after March 31 in 9 years out of 10, after April 14 in half of the years, after April 30 in 1 year out of 10. Fall: the first frost comes before October 9 in 1 year out of 10, before October 22 in half of the years, before November 5 in 9 years out of 10. Typical frost-free season: 192 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 14First frost ~Oct 22Frost season at Lewisburg, TNSpring: a frost after March 31 in 9 years out of 10, after April 14 in half of the years, after April 30 in 1 year out of 10. Fall: the first frost comes before October 9 in 1 year out of 10, before October 22 in half of the years, before November 5 in 9 years out of 10. Typical frost-free season: 192 days.JFMAMJJASONDLast frost ~Apr 14First frost ~Oct 22
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)April 30October 9
50% (typical)April 14October 22
90% (likely)March 31November 5
Frost-free season (32°F, 50% chance)
192 days
Hard frost (28°F), last in spring, 50% chance after
April 3
Hard frost (28°F), first in fall, 50% chance before
November 2

The last 15 years (2006–2020 normals)

Typical last frost April 13 (1 day earlier than the 30-year normal), typical first fall frost October 25 (3 days later). Frost-free season 194 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 Lewisburg: chance of a frost after this dateSpring, chance of a frost after the date: 10% April 30, 20% April 26, 30% April 22, 40% April 18, 50% April 14, 60% April 11, 70% April 8, 80% April 5, 90% March 31. Observed last spring frost in recent years: 2021 April 23, 2022 April 10, 2023 April 25, 2025 April 9, 2026 March 28.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1Apr 30Apr 14Mar 312021: April 232022: April 102023: April 252025: April 92026: March 28Fall at Lewisburg: chance of a frost before this dateFall, chance of a frost before the date: 10% October 9, 20% October 14, 30% October 18, 40% October 20, 50% October 22, 60% October 25, 70% October 28, 80% November 1, 90% November 5. Observed first fall frost in recent years: 2021 November 4, 2022 October 9, 2023 October 31, 2024 October 15, 2025 October 24.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 9Oct 22Nov 52021: November 42022: October 92023: October 312024: October 152025: October 24
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 23November 4
2022April 10October 9
2023April 25October 31
2024incomplete recordOctober 15
2025April 9October 24
2026March 28season not over yet

What these dates mean

The 192 days between the 50% dates in Lewisburg—from the median light-frost date of April 14 in spring to the median light-frost date of October 22 in fall—frame the period when frost is less than even odds. For a gardener, the April 14 and October 22 dates represent the point at which a light frost is as likely as not, giving a reference for planning but not guaranteeing frost-free days.

A cautious spring planting plan uses the April 30 date, which carries a 10 % chance of a frost later, while a cautious fall harvest aims for October 9, which has a 10 % chance of a frost earlier. Hard-frost median dates are April 3 in spring and November 2 in fall; a hard frost at 28 °F can damage or kill plants that would survive a light frost at 32 °F.

How to read the probabilities

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

  • Spring: "10% after April 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 October 9" 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 Lewisburg, TNNumbered nearest stations: 1 — near Shelbyville, TN — 19 mi; 2 — Pulaski, TN — 21 mi; 3 — Columbia, TN — 22 mi; 4 — Fayetteville, TN — 24 mi; 5 — Tullahoma, TN — 34 mi.TNAL25 mi · 40 km1. near Shelbyville, TN — 19 mi12. Pulaski, TN — 21 mi23. Columbia, TN — 22 mi34. Fayetteville, TN — 24 mi45. Tullahoma, TN — 34 mi5
  1. near Shelbyville, TN 19 mi (31 km)
  2. Pulaski, TN 21 mi (33 km)
  3. Columbia, TN 22 mi (35 km)
  4. Fayetteville, TN 24 mi (39 km)
  5. Tullahoma, 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: 35.4139, -86.8086.