Frost dates for Mobile, Alabama
Half of years have their last spring frost by March 3, but 1 year in 10 still frosts after March 21.
A frost date is really a percentile from 30 years of records at a nearby weather station: in about half of years a frost still comes after the median date. Both numbers are below, so you can choose the risk yourself.
The odds
Last spring frost
How often a frost still comes on or after each date.
- 1 year in 10
- March 21
- 1 year in 5
- March 16
- 3 years in 10
- March 12
- 2 years in 5
- March 8
- Half of years (the median)
- March 3
First fall freeze
How often the first freeze comes on or before each date.
- 1 year in 10
- November 8
- 1 year in 5
- November 13
- 3 years in 10
- November 17
- 2 years in 5
- November 21
- Half of years (the median)
- November 25
- Growing season
- about 268 days
- Hardiness zones nearby
- 8b, 9a
- Summer days
- a usual high of about 32 °C90 °F
- Lettuce and spinach run to seed
- April to September, in hot, long days (how we know)
Summer and rain
A growing garden needs about 25 mm1 in of water a week, rain and watering together. Here is what a normal month brings.
- Hot-weather watering
- July to August: days run above 32 °C90 °F and nights stay above 21 °C70 °F, so expect to water daily or every other day (how we know)
Month by month
- January
- high ~16 °C62 °F · low ~5 °C41 °F · rain ~144 mm5.7 in
- February
- high ~19 °C66 °F · low ~7 °C44 °F · rain ~114 mm4.5 in
- March
- high ~22 °C72 °F · low ~10 °C50 °F · rain ~138 mm5.4 in
- April
- high ~25 °C78 °F · low ~13 °C56 °F · rain ~145 mm5.7 in
- May
- high ~29 °C85 °F · low ~18 °C64 °F · rain ~137 mm5.4 in
- June
- high ~32 °C89 °F · low ~22 °C71 °F · rain ~166 mm6.6 in
- July
- high ~33 °C91 °F · low ~23 °C73 °F · rain ~195 mm7.7 in
- August
- high ~33 °C91 °F · low ~23 °C73 °F · rain ~174 mm6.9 in
- September
- high ~31 °C87 °F · low ~20 °C69 °F · rain ~135 mm5.3 in
- October
- high ~26 °C80 °F · low ~15 °C58 °F · rain ~100 mm3.9 in
- November
- high ~21 °C70 °F · low ~9 °C48 °F · rain ~117 mm4.6 in
- December
- high ~18 °C64 °F · low ~6 °C43 °F · rain ~138 mm5.4 in
Where these numbers come from
NOAA NCEI 1991–2020 Climate Normals, the Mobile station (listed by NOAA as Mobile, USW00013894), at 30.68, -88.24. These are that station’s own records, unshifted. The further your garden is from it, the less exactly they describe your ground. The planner finds the nearest station to your garden and lowers its confidence with distance, so no number is presented as if it were measured in your garden.
Cold air also pools in low ground on the clear, still nights when frost happens, so a hollow can freeze while a slope a few hundred feet away does not. No table can know that about your garden. A few seasons of your own logged frosts can.
ZIP codes nearest this station
36521, 36571, 36575, 36587, 36608, 36609, 36613, 36618, 36619, 36688, 36695, 39452.
Nearby stations
Other stations in Alabama.
- Helena, AL, last frost by March 19
- Birmingham Airport, AL, last frost by March 21
- Pinson, AL, last frost by April 4
- Huntsville International Airport, AL, last frost by March 24
When do I plant? · Where the dates come from
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