Walker Mill, MD planting zone & frost dates
Walker Mill is in USDA hardiness zone 7b. The last spring frost usually comes around March 29 and the first fall frost around November 8, for a growing season of about 224 days.
Planting calendar for Walker Mill
Dates are counted from the average last spring frost (March 29) 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: Feb 1 – Feb 15 Transplant outdoors: Apr 5 – Apr 12 |
| Peppers | Start seeds indoors: Jan 18 – Feb 1 Transplant outdoors: Apr 12 – Apr 19 |
| Eggplant | Start seeds indoors: Jan 18 – Feb 1 Transplant outdoors: Apr 12 – Apr 19 |
| Broccoli | Start seeds indoors: Jan 18 – Feb 1 Transplant outdoors: Mar 1 – Mar 15 |
| Cabbage | Start seeds indoors: Jan 18 – Feb 1 Transplant outdoors: Mar 1 – Mar 15 |
| Onions (sets) | Plant outdoors: Mar 1 – Mar 15 |
| Peas | Sow outdoors: Feb 15 – Mar 1 |
| Spinach | Sow outdoors: Feb 15 – Mar 1 |
| Lettuce | Sow outdoors: Mar 1 – Mar 15 |
| Carrots | Sow outdoors: Mar 1 – Mar 15 |
| Potatoes | Plant outdoors: Mar 1 – Mar 15 |
| Beans | Sow outdoors: Apr 5 – Apr 12 |
| Sweet corn | Sow outdoors: Apr 5 – Apr 12 |
| Cucumbers | Sow outdoors: Apr 5 – Apr 12 |
| Squash & zucchini | Sow outdoors: Apr 5 – Apr 12 |
| Basil | Start seeds indoors: Feb 15 – Mar 1 Transplant outdoors: Apr 5 – Apr 12 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Sep 13 (8 weeks before the average first fall frost on Nov 8).
Useful for zone 7b 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 | Mar 15 | Mar 29 | Apr 11 |
| First 32°F frost in fall is before | Nov 23 | Nov 8 | Oct 26 |
How to read it: in spring there is a 10% chance of a frost after April 11, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 26. A hard freeze (28°F) usually ends around March 17.
Nearby cities
- Forestville zone 7b, last frost Apr 9
- Summerfield zone 7b, last frost Mar 29
- Suitland zone 7b, last frost Mar 29
- Suitland-Silver Hill zone 7b, last frost Apr 3
- Largo zone 7b, last frost Apr 9
- Landover zone 7b, last frost Mar 29
- Camp Springs zone 7b, last frost Apr 3
- Kettering zone 7b, last frost Apr 9
Questions
What growing zone is Walker Mill, MD?
Walker Mill is in USDA Plant Hardiness Zone 7b (average extreme winter low 5°F to 10°F), according to the USDA 2023 map.
When is the last frost in Walker Mill?
The average last spring frost (32°F) in Walker Mill is March 29. There is still a 10% chance of frost until April 11.
When can I plant tomatoes in Walker Mill?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Apr 5 – Apr 12. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Natl Arboretum Dc, MD (USC00186350), 8.2 km (5.1 mi) from the city center, elevation 15 m, based on 29 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.