U.S. Frost Dates by Weather Station

NOAA station USW00023034 · Texas

Frost Dates for San Angelo, TX

NOAA weather station San Angelo (USW00023034), Texas · elevation 1890 ft (576 m) · hardiness zone 8a*

  • Lower-risk planting dateafter April 12only 1 spring in 10 still has a frost later
  • Typical last frostMarch 2050% chance of a frost after it
  • Typical first fall frostNovember 1050% chance of a frost before it
  • Frost-free season232 daystypical year, 32°F
  • Hardiness zone8acalculated*

The year at a glance

Frost season at San Angelo, TXSpring: a frost after March 1 in 9 years out of 10, after March 20 in half of the years, after April 12 in 1 year out of 10. Fall: the first frost comes before October 28 in 1 year out of 10, before November 10 in half of the years, before November 28 in 9 years out of 10. Typical frost-free season: 232 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Mar 20First frost ~Nov 10Frost season at San Angelo, TXSpring: a frost after March 1 in 9 years out of 10, after March 20 in half of the years, after April 12 in 1 year out of 10. Fall: the first frost comes before October 28 in 1 year out of 10, before November 10 in half of the years, before November 28 in 9 years out of 10. Typical frost-free season: 232 days.JFMAMJJASONDLast frost ~Mar 20First frost ~Nov 10
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.Today

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 12October 28
50% (typical)March 20November 10
90% (likely)March 1November 28
Frost-free season (32°F, 50% chance)
232 days
Hard frost (28°F), last in spring, 50% chance after
March 6
Hard frost (28°F), first in fall, 50% chance before
November 22

The last 15 years (2006–2020 normals)

Typical last frost March 23 (3 days later than the 30-year normal), typical first fall frost November 7 (3 days earlier). Frost-free season 230 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 San Angelo: chance of a frost after this dateSpring, chance of a frost after the date: 10% April 12, 20% April 5, 30% April 1, 40% March 28, 50% March 20, 60% March 16, 70% March 11, 80% March 7, 90% March 1. Observed last spring frost in recent years: 2021 April 1, 2022 March 13, 2023 February 18, 2024 March 26, 2025 April 7, 2026 March 17.Spring: last frostChance of a frost after this date10%50%90%Mar 1Apr 1Apr 12Mar 20Mar 12021: April 12022: March 132023: February 182024: March 262025: April 72026: March 17Fall at San Angelo: chance of a frost before this dateFall, chance of a frost before the date: 10% October 28, 20% November 1, 30% November 4, 40% November 7, 50% November 10, 60% November 13, 70% November 16, 80% November 21, 90% November 28. Observed first fall frost in recent years: 2021 November 13, 2022 November 12, 2023 October 31, 2024 November 21, 2025 October 30.Fall: first frostChance of a frost before this date10%50%90%Nov 1Dec 1Oct 28Nov 10Nov 282021: November 132022: November 122023: October 312024: November 212025: October 30
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 1November 13
2022March 13November 12
2023February 18October 31
2024March 26November 21
2025April 7October 30
2026March 17season not over yet

What these dates mean

The 232 days between the 32°F 50% dates in San Angelo frame the period of even odds for a light frost, with the spring median on March 20 and the fall median on November 10. In this location the cautious spring date for setting out tender crops is April 12, when only a 10% chance of a later frost remains; planting on March 1 carries a 90% chance of a frost and is a gamble. The cautious fall date to finish harvesting tender crops is October 28, with a 10% chance that a frost has already arrived, while waiting until November 28 involves a 90% chance of an earlier frost. The 50% hard-frost dates are March 6 and November 22, and a hard frost at 28°F can damage plants more severely than 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 12" 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 28" 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 San Angelo, TXNumbered nearest stations: 1 — Water Valley, TX — 25 mi; 2 — Ballinger, TX — 40 mi; 3 — Wingate, TX — 52 mi; 4 — Brady, TX — 69 mi; 5 — Junction, TX — 76 mi.TX50 mi · 80 km1. Water Valley, TX — 25 mi12. Ballinger, TX — 40 mi23. Wingate, TX — 52 mi34. Brady, TX — 69 mi45. Junction, TX — 76 mi5
  1. Water Valley, TX 25 mi (40 km)
  2. Ballinger, TX 40 mi (64 km)
  3. Wingate, TX 52 mi (83 km)
  4. Brady, TX 69 mi (112 km)
  5. Junction, TX 76 mi (122 km)

Sources

* Hardiness zone 8a: zone derived from PRISM 2023 grid at the station location (not the official USDA map). Source data: PRISM Group, Oregon State University.

Station coordinates: 31.3711, -100.4922.