Last frost date in Mountain Brook, AL
Expect the last frost in Mountain Brook around March 21. Frost after April 8 happens in only one year out of ten. The first fall frost usually arrives about November 11, which leaves 236 frost-free days. An early freeze before October 30 happens one year in ten.
- Safe after (10% risk)
- Apr 8
- Average first frost
- Nov 11
- Frost-free season
- 236 days
- Hard freeze (28°F) ends
- Mar 7
No frost in the next 7 nights
National Weather Service forecast, updated Oct 22, 12:57 UTC
- ThuOct 2248°
- FriOct 2347°
- SatOct 2447°
- SunOct 2546°
- MonOct 2646°
- TueOct 2749°
- WedOct 2849°
Planting calendar for Mountain Brook
Windows count forward or back from the average frost dates above. Click a crop for dates across Alabama.
TomatoesMar 28–Apr 11
PumpkinsApr 4–Apr 18
SunflowersMar 21–Apr 11
CucumbersApr 4–Apr 11
CornMar 28–Apr 11
Sweet potatoesApr 11–Apr 25
WatermelonApr 4–Apr 18
Green beansMar 28–Apr 18
ZucchiniMar 28–Apr 11
OkraApr 11–Apr 25
PeppersApr 4–Apr 18
BasilMar 28–Apr 11
Butternut squashMar 28–Apr 11
CantaloupeApr 4–Apr 18
EggplantApr 4–Apr 18
PotatoesFeb 21–Mar 7
OnionsFeb 7–Feb 28
CarrotsFeb 28–Apr 4
LettuceMar 7–Mar 28
BroccoliFeb 21–Mar 7
BeetsFeb 21–Apr 4
PeasFeb 7–Feb 21
CabbageFeb 21–Mar 7
RadishesFeb 14–Mar 28
Brussels sproutsMar 7–Mar 21
SpinachFeb 7–Feb 28
CilantroMar 7–Mar 28
KaleFeb 21–Mar 7
Collard greensFeb 21–Mar 7
TurnipsFeb 21–Mar 7
DillMar 21–Apr 4
CeleryMar 28–Apr 4
CauliflowerMar 7–Mar 21
LeeksMar 7–Mar 21
Swiss chardMar 7–Apr 4
ParsleyMar 7–Mar 28
Tulip bulbsOct 28–Dec 2
GarlicOct 21–Nov 25
Daffodil bulbsOct 14–Nov 25
StrawberriesFeb 21–Mar 7
AsparagusFeb 21–Mar 7Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Feb 28 | Mar 21 | Apr 8 | Oct 30 | Nov 11 | Dec 1 |
| Hard freeze, 28°F | Feb 14 | Mar 7 | Mar 26 | Nov 6 | Nov 24 | Dec 15 |
Read the spring 10% column as the date after which only one year in ten still gets frost. That is the safer date for tomatoes, peppers and basil.
Where these numbers come from
NOAA station Birmingham Airport (USW00013876) sits 5.2 miles from the center of Mountain Brook at 615 feet. Its averages cover 1991 to 2020. Low spots, valleys and open fields can keep getting frost a week or two after the station stops; city centers and lakeshores usually get less of it.
Questions
When is the last frost in Mountain Brook, AL?
The average last frost date in Mountain Brook is March 21, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after April 8.
When is the first frost in Mountain Brook?
The first frost in fall usually comes around November 11. One year in ten it arrives before October 30.
How long is the growing season in Mountain Brook?
About 236 days between the average last and first frost.
When should I plant tomatoes in Mountain Brook?
Plant tomato seedlings outside from March 28 to April 11. Start seeds indoors six to eight weeks earlier.
Nearby in Alabama
- Vestavia HillsMar 21
- BirminghamMar 21
- HomewoodMar 21
- HooverMar 19
- PelhamMar 19
- TrussvilleApr 4
- BessemerMar 23
- HelenaMar 19
- AlabasterMar 12
- CullmanMar 31
- TuscaloosaMar 18
- OxfordMar 23