USDA hardiness zone lookup
Baltimore, MD — USDA Zone 7b
Baltimore, Maryland · 207-day growing season
Frost dates and growing season in Baltimore
| USDA hardiness zone | Zone 7b |
|---|---|
| Average last spring frost | April 13 |
| Average first fall frost | November 6 |
| Growing season length | ~207 days |
| Temperature range (F) | 0 to 10°F |
| Temperature range (C) | -18 to -12°C |
All of Baltimore's mapped ZIP codes fall in the same hardiness band, Zone 7b.
These are 50%-probability averages modeled from Baltimore's USDA hardiness zone and regional climate normals — not a single-station reading. In a typical year the last spring frost will have passed by April 13, but a colder-than-average year can run 1-2 weeks later. Plant tender crops (tomatoes, peppers, basil) once both soil and night temperatures are consistently warm — a thermometer beats the calendar.
Growing season in Baltimore
Baltimore, Maryland sits in USDA Zone 7b, with roughly 207 frost-free days between an average last spring frost around April 13 and a first fall frost around November 6. That is a long season — succession-sow through summer and run a full fall crop; heat-sensitive greens still need spring/autumn timing. Baltimore lies near 39.3°N; higher-latitude gardens get longer midsummer days but a tighter shoulder season at this zone. As a large metro, the built-up core typically runs up to half a zone warmer than outlying suburbs through the urban heat-island effect — sheltered city gardens often push tender crops a little earlier than the average suggests.
What grows in Baltimore
Baltimore falls in USDA Zone 7b, so the same hardiness constraints apply as the full Zone 7 guide. Vegetables, herbs, and fruit trees rated to Zone 7b (or hardier) will overwinter here in a typical year.
- Tomatoes, peppers, eggplant
- Okra
- Sweet potatoes
- Squash, melons
- Beans (lima + pole)
- Figs
- Pomegranates (in protected spots)
- Apples, peaches, plums, pears
- Blueberries (rabbiteye + highbush)
- Asparagus, rhubarb
What to plant in Baltimore this week
Baltimore is in high summer — most spring plantings are in. Keep an eye on watering and start planning your fall crop. Cool-season seedlings (broccoli, cabbage, lettuce) can be started indoors for a fall transplant.
- When to plant tomatoes in zone 7
- When to plant peppers in zone 7
- When to plant bush beans in zone 7
- When to plant cucumbers in zone 7
- When to plant basil in zone 7
Full planting calendar for Baltimore
Crop-by-crop sowing, transplant, and harvest dates calibrated to zone 7 averages:
- When to plant tomatoes in zone 7
- When to plant peppers in zone 7
- When to plant basil in zone 7
- When to plant garlic in zone 7
- When to plant lettuce in zone 7
- When to plant bush beans in zone 7
- When to plant cucumbers in zone 7
- When to plant summer squash in zone 7
- When to plant peas in zone 7
- When to plant carrots in zone 7
ZIP codes in Baltimore
Drill down to the precise frost window and planting calendar for a specific ZIP in Baltimore:
- 21201 — Baltimore (Zone 7b)
- 21215 — Baltimore (Northwest) (Zone 7b)
- 21224 — Baltimore (Highlandtown) (Zone 7b)
Local microclimate notes
Zone tables give you the average — but Baltimoregardens vary. South-facing walls and paved areas can run a full half-zone warmer than the published rating. Low-lying spots, frost pockets, and shaded north sides can run colder. If you've gardened here a few seasons, your own frost record — the last time you actually got frost damage — beats any national average.
Source and methodology
Hardiness zone from the USDA Plant Hardiness Zone Map (2023 revision). Frost-date and growing-season figures are modeled from Baltimore's USDA hardiness zone and regional NOAA 1991-2020 climate normals — zone-level estimates, not a per-station record, so treat them as planning guidance and confirm against your own local frost history. Crop recommendations draw on US Cooperative Extension references, curated by the Growli editorial team. Last reviewed June 2026.
Other cities in Maryland
- Annapolis, MD — USDA Zone 7b
- Frederick, MD — USDA Zone 7a
- Gaithersburg, MD — USDA Zone 7a
- Germantown, MD — USDA Zone 7a
- Greenbelt, MD — USDA Zone 7b
- Hagerstown, MD — USDA Zone 7a
- Rockville, MD — USDA Zone 7a
- Salisbury, MD — USDA Zone 7b
- Silver Spring, MD — USDA Zone 7a
- Upper Marlboro, MD — USDA Zone 7b
- All of Maryland by zone