Mountain Brook, AL planting zone & frost dates
Mountain Brook is in USDA hardiness zone 8b. The last spring frost usually comes around March 21 and the first fall frost around November 11, for a growing season of about 236 days.
Planting calendar for Mountain Brook
Dates are counted from the average last spring frost (March 21) using the typical timing recommended by U.S. extension services. Warm-season crops go out only after the danger of frost has passed and the soil has warmed.
| Crop | When |
|---|---|
| Tomatoes | Start seeds indoors: Jan 24 – Feb 7 Transplant outdoors: Mar 28 – Apr 4 |
| Peppers | Start seeds indoors: Jan 10 – Jan 24 Transplant outdoors: Apr 4 – Apr 11 |
| Eggplant | Start seeds indoors: Jan 10 – Jan 24 Transplant outdoors: Apr 4 – Apr 11 |
| Broccoli | Start seeds indoors: Jan 10 – Jan 24 Transplant outdoors: Feb 21 – Mar 7 |
| Cabbage | Start seeds indoors: Jan 10 – Jan 24 Transplant outdoors: Feb 21 – Mar 7 |
| Onions (sets) | Plant outdoors: Feb 21 – Mar 7 |
| Peas | Sow outdoors: Feb 7 – Feb 21 |
| Spinach | Sow outdoors: Feb 7 – Feb 21 |
| Lettuce | Sow outdoors: Feb 21 – Mar 7 |
| Carrots | Sow outdoors: Feb 21 – Mar 7 |
| Potatoes | Plant outdoors: Feb 21 – Mar 7 |
| Beans | Sow outdoors: Mar 28 – Apr 4 |
| Sweet corn | Sow outdoors: Mar 28 – Apr 4 |
| Cucumbers | Sow outdoors: Mar 28 – Apr 4 |
| Squash & zucchini | Sow outdoors: Mar 28 – Apr 4 |
| Basil | Start seeds indoors: Feb 7 – Feb 21 Transplant outdoors: Mar 28 – Apr 4 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Sep 16 (8 weeks before the average first fall frost on Nov 11).
Useful for zone 8b gardens
- Seed starting kit with dome — to start seeds indoors before the last frost
- LED grow light for seedlings — stops leggy seedlings
- Frost cloth / plant covers — for late spring and early fall frosts
- Soil thermometer — warm-season crops need soil above 60°F
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Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Feb 28 | Mar 21 | Apr 8 |
| First 32°F frost in fall is before | Dec 1 | Nov 11 | Oct 30 |
How to read it: in spring there is a 10% chance of a frost after April 8, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 30. A hard freeze (28°F) usually ends around March 7.
Nearby cities
- Birmingham zone 8a, last frost Mar 21
- Homewood zone 8b, last frost Mar 21
- Irondale zone 8a, last frost Mar 21
- Vestavia Hills zone 8b, last frost Mar 21
- Hoover zone 8b, last frost Mar 19
- Forestdale zone 8a, last frost Mar 21
- Center Point zone 8a, last frost Apr 4
- Fairfield zone 8b, last frost Mar 23
Questions
What growing zone is Mountain Brook, AL?
Mountain Brook is in USDA Plant Hardiness Zone 8b (average extreme winter low 15°F to 20°F), according to the USDA 2023 map.
When is the last frost in Mountain Brook?
The average last spring frost (32°F) in Mountain Brook is March 21. There is still a 10% chance of frost until April 8.
When can I plant tomatoes in Mountain Brook?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Mar 28 – Apr 4. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Birmingham Ap, AL (USW00013876), 7.2 km (4.5 mi) from the city center, elevation 188 m, based on 28 years of records. Hardiness zone: USDA Plant Hardiness Zone Map 2023 for the ZIP code nearest to the city center. Microclimates (valleys, hills, cities, coasts) can be warmer or colder: check the local forecast before planting. How we calculate the data.