U.S. Frost Dates by Weather Station

NOAA station USW00022010 · Texas

Frost Dates for Del Rio, TX

NOAA weather station Del Rio International Airport (USW00022010), Texas · elevation 999 ft (305 m) · hardiness zone 9a*

  • Lower-risk planting dateafter March 10only 1 spring in 10 still has a frost later
  • Typical last frostFebruary 1650% chance of a frost after it
  • Typical first fall frostDecember 350% chance of a frost before it
  • Frost-free season293 daystypical year, 32°F
  • Hardiness zone9acalculated*

The year at a glance

Frost season at Del Rio, TXSpring: a frost after January 19 in 9 years out of 10, after February 16 in half of the years, after March 10 in 1 year out of 10. Fall: the first frost comes before November 14 in 1 year out of 10, before December 3 in half of the years, before December 26 in 9 years out of 10. Typical frost-free season: 293 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Feb 16First frost ~Dec 3Frost season at Del Rio, TXSpring: a frost after January 19 in 9 years out of 10, after February 16 in half of the years, after March 10 in 1 year out of 10. Fall: the first frost comes before November 14 in 1 year out of 10, before December 3 in half of the years, before December 26 in 9 years out of 10. Typical frost-free season: 293 days.JFMAMJJASONDLast frost ~Feb 16First frost ~Dec 3
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)March 10November 14
50% (typical)February 16December 3
90% (likely)January 19December 26
Frost-free season (32°F, 50% chance)
293 days
Hard frost (28°F), last in spring, 50% chance after
January 24
Hard frost (28°F), first in fall, 50% chance before
December 18

The last 15 years (2006–2020 normals)

Typical last frost February 15 (1 day earlier than the 30-year normal), typical first fall frost December 4 (1 day later). Frost-free season 291 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 Del Rio: chance of a frost after this dateSpring, chance of a frost after the date: 10% March 10, 20% March 3, 30% February 26, 40% February 21, 50% February 16, 60% February 10, 70% February 5, 80% January 29, 90% January 19. Observed last spring frost in recent years: 2021 February 20, 2022 March 12, 2023 February 17, 2024 January 20, 2025 February 20, 2026 February 1.Spring: last frostChance of a frost after this date10%50%90%Feb 1Mar 1Mar 10Feb 16Jan 192021: February 202022: March 122023: February 172024: January 202025: February 202026: February 1Fall at Del Rio: chance of a frost before this dateFall, chance of a frost before the date: 10% November 14, 20% November 21, 30% November 25, 40% November 30, 50% December 3, 60% December 7, 70% December 11, 80% December 17, 90% December 26. Observed first fall frost in recent years: 2021 January 3, 2022 December 22, 2023 December 30, 2024 December 11, 2025 January 18.Fall: first frostChance of a frost before this date10%50%90%Nov 1Dec 1Jan 1Nov 14Dec 3Dec 262021: January 32022: December 222023: December 302024: December 112025: January 18
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
2021February 20January 3
2022March 12December 22
2023February 17December 30
2024January 20December 11
2025February 20January 18
2026February 1season not over yet

What these dates mean

March 10 is the cautious spring date for light frost in Del Rio, marking the point at which there is only a 10 % chance of a frost occurring later and therefore the earliest day a gardener can plan to set out tender crops with minimal risk.

The 50 % spring light-frost date is February 16, indicating an even odds chance of a frost later than that day; the 50 % fall light-frost date is December 3, indicating an even odds chance of a frost earlier than that day. For a cautious fall schedule the gardener should finish harvesting tender crops by November 14, when there is only a 10 % chance that a frost has arrived earlier.

Hard frosts, recorded at 28 °F, are more damaging than light frosts at 32 °F, so the median hard-frost dates of January 24 in spring and December 18 in fall signal when a gardener should consider the greater risk of severe cold.

How to read the probabilities

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

  • Spring: "10% after March 10" 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 November 14" 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 Del Rio, TXNumbered nearest stations: 1 — Carrizo Springs, TX — 88 mi; 2 — Junction, TX — 100 mi; 3 — Kerrville, TX — 119 mi; 4 — Fredericksburg, TX — 135 mi; 5 — Boerne, TX — 135 mi.TX50 mi · 80 km1. Carrizo Springs, TX — 88 mi12. Junction, TX — 100 mi23. Kerrville, TX — 119 mi34. Fredericksburg, TX — 135 mi45. Boerne, TX — 135 mi5
  1. Carrizo Springs, TX 88 mi (142 km)
  2. Junction, TX 100 mi (161 km)
  3. Kerrville, TX 119 mi (192 km)
  4. Fredericksburg, TX 135 mi (217 km)
  5. Boerne, TX 135 mi (217 km)

Sources

* Hardiness zone 9a: zone derived from PRISM 2023 grid at the station location (not the official USDA map). Source data: PRISM Group, Oregon State University.

Station coordinates: 29.3783, -100.9269.