U.S. Frost Dates by Weather Station

NOAA station USC00410902 · Texas

Frost Dates for Boerne, TX

NOAA weather station Boerne (USC00410902), Texas · elevation 1445 ft (440 m) · hardiness zone 8b*

  • Lower-risk planting dateafter April 8only 1 spring in 10 still has a frost later
  • Typical last frostMarch 1550% chance of a frost after it
  • Typical first fall frostNovember 1350% chance of a frost before it
  • Frost-free season243 daystypical year, 32°F
  • Hardiness zone8bcalculated*

The year at a glance

Frost season at Boerne, TXSpring: a frost after February 23 in 9 years out of 10, after March 15 in half of the years, after April 8 in 1 year out of 10. Fall: the first frost comes before October 31 in 1 year out of 10, before November 13 in half of the years, before December 4 in 9 years out of 10. Typical frost-free season: 243 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Mar 15First frost ~Nov 13Frost season at Boerne, TXSpring: a frost after February 23 in 9 years out of 10, after March 15 in half of the years, after April 8 in 1 year out of 10. Fall: the first frost comes before October 31 in 1 year out of 10, before November 13 in half of the years, before December 4 in 9 years out of 10. Typical frost-free season: 243 days.JFMAMJJASONDLast frost ~Mar 15First frost ~Nov 13
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 8October 31
50% (typical)March 15November 13
90% (likely)February 23December 4
Frost-free season (32°F, 50% chance)
243 days
Hard frost (28°F), last in spring, 50% chance after
March 2
Hard frost (28°F), first in fall, 50% chance before
November 27

The last 15 years (2006–2020 normals)

Typical last frost March 14 (1 day earlier than the 30-year normal), typical first fall frost November 14 (1 day later). Frost-free season 243 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 Boerne: chance of a frost after this dateSpring, chance of a frost after the date: 10% April 8, 20% April 1, 30% March 27, 40% March 20, 50% March 15, 60% March 12, 70% March 7, 80% March 2, 90% February 23. Observed last spring frost in recent years: 2021 March 4, 2023 February 19, 2024 February 19, 2025 February 23, 2026 March 18.Spring: last frostChance of a frost after this date10%50%90%Mar 1Apr 1Apr 8Mar 15Feb 232021: March 42023: February 192024: February 192025: February 232026: March 18Fall at Boerne: chance of a frost before this dateFall, chance of a frost before the date: 10% October 31, 20% November 3, 30% November 6, 40% November 10, 50% November 13, 60% November 17, 70% November 22, 80% November 28, 90% December 4. Observed first fall frost in recent years: 2021 December 12, 2022 November 13, 2023 November 1, 2024 December 11, 2025 December 9.Fall: first frostChance of a frost before this date10%50%90%Nov 1Dec 1Oct 31Nov 13Dec 42021: December 122022: November 132023: November 12024: December 112025: December 9
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
2021March 4December 12
2022incomplete recordNovember 13
2023February 19November 1
2024February 19December 11
2025February 23December 9
2026March 18season not over yet

What these dates mean

October 31 marks the cautious fall date in Boerne for finishing the harvest of tender crops, when there is only a 10 percent chance that a light frost has arrived. For spring planting, the cautious date is April 8, the point at which a light frost later than that date is unlikely (10 percent), while setting out tender crops on February 23 carries a 90 percent chance of an early frost and is a gamble.

The 50 percent dates are the points of even odds: March 15 for spring light frosts and November 13 for fall light frosts. A gardener can view these dates as the middle of the historical range, meaning there is an equal chance of a frost occurring either side of each date.

Hard-frost thresholds are lower, so the 28 °F median dates—March 2 in spring and November 27 in fall—signal conditions that can damage plants more severely than the 32 °F light-frost dates.

How to read the probabilities

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

  • Spring: "10% after April 8" 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 31" 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 Boerne, TXNumbered nearest stations: 1 — Blanco, TX — 28 mi; 2 — Kerrville, TX — 29 mi; 3 — Fredericksburg, TX — 32 mi; 4 — near Canyon Lake, TX — 33 mi; 5 — San Marcos, TX — 47 mi.TX25 mi · 40 km1. Blanco, TX — 28 mi12. Kerrville, TX — 29 mi23. Fredericksburg, TX — 32 mi34. near Canyon Lake, TX — 33 mi45. San Marcos, TX — 47 mi5
  1. Blanco, TX 28 mi (45 km)
  2. Kerrville, TX 29 mi (47 km)
  3. Fredericksburg, TX 32 mi (52 km)
  4. near Canyon Lake, TX 33 mi (52 km)
  5. San Marcos, TX 47 mi (76 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: 29.7986, -98.7353.