U.S. Frost Dates by Weather Station

NOAA station USC00160800 · Louisiana

Frost Dates for Bienville, LA

NOAA weather station Bienville 3 NE (USC00160800), Louisiana · elevation 307 ft (94 m) · hardiness zone 8b*

  • Lower-risk planting dateafter April 10only 1 spring in 10 still has a frost later
  • Typical last frostMarch 1950% chance of a frost after it
  • Typical first fall frostNovember 950% chance of a frost before it
  • Frost-free season237 daystypical year, 32°F
  • Hardiness zone8bcalculated*

The year at a glance

Frost season at Bienville, LASpring: a frost after February 26 in 9 years out of 10, after March 19 in half of the years, after April 10 in 1 year out of 10. Fall: the first frost comes before October 27 in 1 year out of 10, before November 9 in half of the years, before November 29 in 9 years out of 10. Typical frost-free season: 237 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Mar 19First frost ~Nov 9Frost season at Bienville, LASpring: a frost after February 26 in 9 years out of 10, after March 19 in half of the years, after April 10 in 1 year out of 10. Fall: the first frost comes before October 27 in 1 year out of 10, before November 9 in half of the years, before November 29 in 9 years out of 10. Typical frost-free season: 237 days.JFMAMJJASONDLast frost ~Mar 19First frost ~Nov 9
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 30 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)April 10October 27
50% (typical)March 19November 9
90% (likely)February 26November 29
Frost-free season (32°F, 50% chance)
237 days
Hard frost (28°F), last in spring, 50% chance after
March 4
Hard frost (28°F), first in fall, 50% chance before
November 23

The last 15 years (2006–2020 normals)

Typical last frost March 15 (4 days earlier than the 30-year normal), typical first fall frost November 10 (1 day later). Frost-free season 241 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 Bienville: chance of a frost after this dateSpring, chance of a frost after the date: 10% April 10, 20% April 3, 30% March 30, 40% March 25, 50% March 19, 60% March 15, 70% March 11, 80% March 4, 90% February 26. Observed last spring frost in recent years: 2021 March 3, 2022 March 13, 2023 March 20, 2024 March 19, 2025 March 21, 2026 March 17.Spring: last frostChance of a frost after this date10%50%90%Mar 1Apr 1Apr 10Mar 19Feb 262021: March 32022: March 132023: March 202024: March 192025: March 212026: March 17Fall at Bienville: chance of a frost before this dateFall, chance of a frost before the date: 10% October 27, 20% October 31, 30% November 3, 40% November 6, 50% November 9, 60% November 13, 70% November 17, 80% November 22, 90% November 29. Observed first fall frost in recent years: 2021 November 19, 2022 October 19, 2023 November 2, 2024 November 29, 2025 November 10.Fall: first frostChance of a frost before this date10%50%90%Nov 1Dec 1Oct 27Nov 9Nov 292021: November 192022: October 192023: November 22024: November 292025: 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
2021March 3November 19
2022March 13October 19
2023March 20November 2
2024March 19November 29
2025March 21November 10
2026March 17season not over yet

What these dates mean

October 27 marks the cautious fall date for finishing the harvest in Bienville; there is only a ten-percent chance that a light frost has arrived earlier. In the spring the comparable cautious date is April 10, when the chance of a light frost later than that day is ten percent, making it the date to set out tender crops. The 50 % dates are March 19 for spring and November 9 for fall; they represent an even odds of a light frost occurring later (spring) or earlier (fall), so a gardener can view them as the midpoint of frost risk. The hard-frost 50 % dates are March 4 and November 23, indicating the median point for a 28 °F event. A hard frost at 28 °F can damage plants that survive a light frost at 32 °F, so the lower temperature dates are more critical for protecting tender crops.

How to read the probabilities

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

  • Spring: "10% after April 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 October 27" 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 Bienville, LANumbered nearest stations: 1 — Minden, LA — 26 mi; 2 — Homer, LA — 31 mi; 3 — near Bossier City, LA — 41 mi; 4 — Shreveport, LA — 53 mi; 5 — Monroe, LA — 54 mi.LAAR25 mi · 40 km1. Minden, LA — 26 mi12. Homer, LA — 31 mi23. near Bossier City, LA — 41 mi34. Shreveport, LA — 53 mi45. Monroe, LA — 54 mi5
  1. Minden, LA 26 mi (42 km)
  2. Homer, LA 31 mi (50 km)
  3. near Bossier City, LA 41 mi (65 km)
  4. Shreveport, LA 53 mi (85 km)
  5. Monroe, LA 54 mi (86 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: 32.3744, -92.9433.