When is the last frost in Saint Bernard, LA?

For ZIP code 70085, the average last spring frost (32°F) is February 4, based on NOAA 1991-2020 climate normals for the St Bernard, LA weather station. There is a 1-in-10 chance of a frost after March 6.

When is the first frost in Saint Bernard, LA?

The average first fall frost (32°F) is December 15. There is a 1-in-10 chance of frost by November 23, so tender plants are at risk from that point on.

How long is the growing season in 70085?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 312 days long.

Are these frost dates a forecast?

No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.

Frost dates for 70085Saint Bernard, LA

The average last spring frost in Saint Bernard is February 4 and the average first fall frost is December 15, giving a typical growing season of about 312 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Feb 4
Average first fall frost: Dec 15
Growing season: 312 days

Frost risk by date

NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.

Spring dates: chance of a frost AFTER the date. Fall dates: chance of a frost BEFORE the date.
Temperature	Last spring: 90% / 50% / 10% chance	First fall: 10% / 50% / 90% chance	Growing season (50%)	Years with at least one
Light frost (36°F)	Jan 31 · Feb 26 · Mar 20	Nov 12 · Nov 30 · Dec 23	277 days	100%
Frost / freeze (32°F)	Dec 31 · Feb 4 · Mar 6	Nov 23 · Dec 15 · Jan 10	312 days	97%
Hard freeze (28°F)	Dec 21 · Jan 21 · Feb 23	Dec 4 · Dec 30 · Jan 24	344 days	75%

Where these dates come from

ZIP code 70085 is matched to the NOAA station St Bernard, LA, 1.4 km away, at 5 ft elevation (5 ft higher than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
St Bernard, LA (used)	5 ft	Feb 4	Dec 15
Chalmette, LA	3 ft	Feb 10	Dec 17
New Orleans Alvin Callender Fl, LA	5 ft	Feb 18	Dec 6
Terrytown 3S, LA	10 ft	Feb 1	Dec 31

Frost dates near Saint Bernard

Violet, LA 70092 · last Feb 1, first Dec 31
Meraux, LA 70075 · last Feb 1, first Dec 31
Belle Chasse, LA 70093 · last Feb 1, first Dec 31
Chalmette, LA 70043 · last Feb 1, first Dec 31
Braithwaite, LA 70040 · last Feb 10, first Dec 12
New Orleans, LA 70131 · last Feb 1, first Dec 31
Arabi, LA 70032 · last Feb 1, first Dec 31
Gretna, LA 70056 · last Feb 1, first Dec 31

Frequently asked questions

When is the last frost in Saint Bernard, LA?: For ZIP code 70085, the average last spring frost (32°F) is February 4, based on NOAA 1991-2020 climate normals for the St Bernard, LA weather station. There is a 1-in-10 chance of a frost after March 6.
When is the first frost in Saint Bernard, LA?: The average first fall frost (32°F) is December 15. There is a 1-in-10 chance of frost by November 23, so tender plants are at risk from that point on.
How long is the growing season in 70085?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 312 days long.
Are these frost dates a forecast?: No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.