Frost dates for Huntsville International Airport, Alabama
Half of years have their last spring frost by March 24, but 1 year in 10 still frosts after April 8.
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
- April 8
- 1 year in 5
- April 3
- 3 years in 10
- March 31
- 2 years in 5
- March 27
- Half of years (the median)
- March 24
First fall freeze
How often the first freeze comes on or before each date.
- 1 year in 10
- October 27
- 1 year in 5
- October 31
- 3 years in 10
- November 2
- 2 years in 5
- November 5
- Half of years (the median)
- November 8
- Growing season
- about 229 days
- Hardiness zone nearby
- 8a
- Summer days
- a usual high of about 33 °C91 °F
- Lettuce and spinach run to seed
- May 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: 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 ~11 °C52 °F · low ~1 °C33 °F · rain ~127 mm5 in
- February
- high ~14 °C57 °F · low ~2 °C36 °F · rain ~130 mm5.1 in
- March
- high ~19 °C65 °F · low ~6 °C43 °F · rain ~137 mm5.4 in
- April
- high ~24 °C75 °F · low ~11 °C51 °F · rain ~123 mm4.9 in
- May
- high ~28 °C83 °F · low ~16 °C60 °F · rain ~119 mm4.7 in
- June
- high ~32 °C89 °F · low ~20 °C68 °F · rain ~103 mm4.1 in
- July
- high ~33 °C92 °F · low ~22 °C71 °F · rain ~114 mm4.5 in
- August
- high ~33 °C91 °F · low ~21 °C70 °F · rain ~90 mm3.6 in
- September
- high ~30 °C87 °F · low ~17 °C63 °F · rain ~89 mm3.5 in
- October
- high ~24 °C76 °F · low ~11 °C52 °F · rain ~90 mm3.6 in
- November
- high ~18 °C64 °F · low ~5 °C41 °F · rain ~108 mm4.2 in
- December
- high ~13 °C55 °F · low ~2 °C36 °F · rain ~149 mm5.9 in
Where these numbers come from
NOAA NCEI 1991–2020 Climate Normals, the Huntsville International Airport station (listed by NOAA as Huntsville Intl Ap, USW00003856), at 34.64, -86.79. 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
35601, 35603, 35615, 35640, 35649, 35670, 35671, 35749, 35756, 35757, 35758, 35775…
+7 moreShow fewer
35805, 35806, 35808, 35810, 35816, 35824, 35896.
Nearby stations
The nearest stations and how their last-frost dates compare. Together they show how frost varies across your area.
- Pinson, AL, last frost by April 4
- Birmingham Airport, AL, last frost by March 21
- Chickamauga 2 SW, GA, last frost by March 25
- Helena, AL, last frost by March 19
Other stations in Alabama.
- Mobile, AL, last frost by March 3
When do I plant? · Where the dates come from
More ways Milpa can help
When do I plant? · What grows well together? · Plan my garden · What can I plant now? · Something wrong in the garden? · Keep a garden diary · Heard a tip?