U.S. Frost Dates by Weather Station

NOAA station USC00406162 · Tennessee

Frost Dates for Monteagle, TN

NOAA weather station Monteagle (USC00406162), Tennessee · elevation 1850 ft (564 m) · hardiness zone 7b*

  • Lower-risk planting dateafter April 27only 1 spring in 10 still has a frost later
  • Typical last frostApril 1050% chance of a frost after it
  • Typical first fall frostOctober 2850% chance of a frost before it
  • Frost-free season201 daystypical year, 32°F
  • Hardiness zone7bcalculated*

The year at a glance

Frost season at Monteagle, TNSpring: a frost after March 26 in 9 years out of 10, after April 10 in half of the years, after April 27 in 1 year out of 10. Fall: the first frost comes before October 15 in 1 year out of 10, before October 28 in half of the years, before November 12 in 9 years out of 10. Typical frost-free season: 201 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 10First frost ~Oct 28Frost season at Monteagle, TNSpring: a frost after March 26 in 9 years out of 10, after April 10 in half of the years, after April 27 in 1 year out of 10. Fall: the first frost comes before October 15 in 1 year out of 10, before October 28 in half of the years, before November 12 in 9 years out of 10. Typical frost-free season: 201 days.JFMAMJJASONDLast frost ~Apr 10First frost ~Oct 28
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 27 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)April 27October 15
50% (typical)April 10October 28
90% (likely)March 26November 12
Frost-free season (32°F, 50% chance)
201 days
Hard frost (28°F), last in spring, 50% chance after
March 29
Hard frost (28°F), first in fall, 50% chance before
November 7

The last 15 years (2006–2020 normals)

Typical last frost April 9 (1 day earlier than the 30-year normal), typical first fall frost October 30 (2 days later). Frost-free season 204 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 Monteagle: chance of a frost after this dateSpring, chance of a frost after the date: 10% April 27, 20% April 21, 30% April 17, 40% April 13, 50% April 10, 60% April 7, 70% April 4, 80% March 31, 90% March 26. Observed last spring frost in recent years: 2021 April 22, 2022 April 19, 2023 March 29, 2024 April 6, 2025 April 13, 2026 March 28.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1Apr 27Apr 10Mar 262021: April 222022: April 192023: March 292024: April 62025: April 132026: March 28Fall at Monteagle: chance of a frost before this dateFall, chance of a frost before the date: 10% October 15, 20% October 20, 30% October 23, 40% October 26, 50% October 28, 60% October 31, 70% November 2, 80% November 6, 90% November 12. Observed first fall frost in recent years: 2021 November 6, 2022 October 18, 2023 November 1, 2024 October 17, 2025 November 10.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 15Oct 28Nov 122021: November 62022: October 182023: November 12024: October 172025: 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 6
2022April 19October 18
2023March 29November 1
2024April 6October 17
2025April 13November 10
2026March 28season not over yet

What these dates mean

The 201 days between the 32°F 50% dates in Monteagle define the period in which a light frost is equally likely to have occurred or not. The median 32°F dates are April 10 in spring and October 28 in fall; they are not frost dates but simply the points of even odds for a light frost. For a cautious spring plan, the 10 % chance date is April 27, while the risky early option is March 26 with a 90 % chance. In the autumn, the cautious date is October 15, also at 10 % chance, and the gamble lies at November 12 with a 90 % chance.

The hard-frost 50% dates are March 29 and November 7, and a hard frost at 28 °F can damage plant tissue that survives a light frost at 32 °F, so it carries greater risk.

How to read the probabilities

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

  • Spring: "10% after April 27" 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 15" 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 Monteagle, TNNumbered nearest stations: 1 — Tullahoma, TN — 22 mi; 2 — McMinnville, TN — 31 mi; 3 — near Chattanooga, TN — 39 mi; 4 — Chickamauga, GA — 39 mi; 5 — Scottsboro, AL — 40 mi.TNALGA25 mi · 40 km1. Tullahoma, TN — 22 mi12. McMinnville, TN — 31 mi23. near Chattanooga, TN — 39 mi34. Chickamauga, GA — 39 mi45. Scottsboro, AL — 40 mi5
  1. Tullahoma, TN 22 mi (36 km)
  2. McMinnville, TN 31 mi (50 km)
  3. near Chattanooga, TN 39 mi (62 km)
  4. Chickamauga, GA 39 mi (63 km)
  5. Scottsboro, AL 40 mi (64 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: 35.2242, -85.8414.