U.S. Frost Dates by Weather Station

NOAA station USC00381277 · South Carolina

Frost Dates for Calhoun Falls, SC

NOAA weather station Calhoun Falls (USC00381277), South Carolina · elevation 530 ft (162 m) · hardiness zone 8b*

  • Lower-risk planting dateafter April 11only 1 spring in 10 still has a frost later
  • Typical last frostMarch 2750% chance of a frost after it
  • Typical first fall frostNovember 750% chance of a frost before it
  • Frost-free season226 daystypical year, 32°F
  • Hardiness zone8bcalculated*

The year at a glance

Frost season at Calhoun Falls, SCSpring: a frost after March 8 in 9 years out of 10, after March 27 in half of the years, after April 11 in 1 year out of 10. Fall: the first frost comes before October 26 in 1 year out of 10, before November 7 in half of the years, before November 24 in 9 years out of 10. Typical frost-free season: 226 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Mar 27First frost ~Nov 7Frost season at Calhoun Falls, SCSpring: a frost after March 8 in 9 years out of 10, after March 27 in half of the years, after April 11 in 1 year out of 10. Fall: the first frost comes before October 26 in 1 year out of 10, before November 7 in half of the years, before November 24 in 9 years out of 10. Typical frost-free season: 226 days.JFMAMJJASONDLast frost ~Mar 27First frost ~Nov 7
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)April 11October 26
50% (typical)March 27November 7
90% (likely)March 8November 24
Frost-free season (32°F, 50% chance)
226 days
Hard frost (28°F), last in spring, 50% chance after
March 13
Hard frost (28°F), first in fall, 50% chance before
November 22

The last 15 years (2006–2020 normals)

Typical last frost March 27 (same as the 30-year normal), typical first fall frost November 8 (1 day later). Frost-free season 227 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 Calhoun Falls: chance of a frost after this dateSpring, chance of a frost after the date: 10% April 11, 20% April 5, 30% April 1, 40% March 29, 50% March 27, 60% March 23, 70% March 19, 80% March 16, 90% March 8. Observed last spring frost in recent years: 2021 April 22, 2022 April 11, 2023 March 22, 2024 March 20, 2025 March 7, 2026 March 19.Spring: last frostChance of a frost after this date10%50%90%Mar 1Apr 1Apr 11Mar 27Mar 82021: April 222022: April 112023: March 222024: March 202025: March 72026: March 19Fall at Calhoun Falls: chance of a frost before this dateFall, chance of a frost before the date: 10% October 26, 20% October 31, 30% November 2, 40% November 5, 50% November 7, 60% November 10, 70% November 14, 80% November 18, 90% November 24. Observed first fall frost in recent years: 2021 November 14, 2022 October 21, 2023 November 2, 2024 November 30, 2025 November 11.Fall: first frostChance of a frost before this date10%50%90%Nov 1Dec 1Oct 26Nov 7Nov 242021: November 142022: October 212023: November 22024: November 302025: 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
2021April 22November 14
2022April 11October 21
2023March 22November 2
2024March 20November 30
2025March 7November 11
2026March 19season not over yet

What these dates mean

The cautious fall date in Calhoun Falls for finishing the harvest is October 26, when there is a 10 % chance a light frost has arrived earlier.

The 50% date for light frost in spring is March 27 and the 50% date in fall is November 7; each marks the point at which a light frost is equally likely to have occurred as not. The median hard-frost dates are March 13 in spring and November 22 in fall, indicating when a temperature of 28 °F is equally likely to have been reached.

A cautious planting schedule uses the April 11 date for setting out tender crops in spring, because only a 10 % chance of a later light frost remains, while the October 26 date guides the final harvest in fall. Hard frosts at 28 °F are more damaging than light frosts at 32 °F, so their timing is especially important for protecting vulnerable plants.

How to read the probabilities

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

  • Spring: "10% after April 11" 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 26" 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 Calhoun Falls, SCNumbered nearest stations: 1 — Elberton, GA — 16 mi; 2 — Anderson County Airport, SC — 29 mi; 3 — Anderson, SC — 31 mi; 4 — Appling, GA — 40 mi; 5 — Clemson, SC — 42 mi.SCGA25 mi · 40 km1. Elberton, GA — 16 mi12. Anderson County Airport, SC — 29 mi23. Anderson, SC — 31 mi34. Appling, GA — 40 mi45. Clemson, SC — 42 mi5
  1. Elberton, GA 16 mi (25 km)
  2. Anderson County Airport, SC 29 mi (47 km)
  3. Anderson, SC 31 mi (49 km)
  4. Appling, GA 40 mi (64 km)
  5. Clemson, SC 42 mi (67 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: 34.0906, -82.5883.