Baltimore, MD Frost Dates
Average frost dates, USDA hardiness zone, and growing season length for Baltimore, Maryland.
Gardening in Baltimore
Baltimore's gardening culture is as neighborhood-focused as the city itself. Each pocket of the city — Hampden, Canton, Remington, Charles Village — has its own garden personality. The row house tradition means creative container and vertical gardening is a Baltimore specialty.
The Chesapeake Bay moderates Baltimore's climate, keeping winters milder and summers slightly less extreme than inland Maryland. Your 223-day growing season is generous for the mid-Atlantic. The soil varies by neighborhood — some areas have rich bottomland, others have decades of urban fill that requires raised beds.
Ravens fans know about tough, physical performance in any conditions — Baltimore gardeners relate, especially when wrestling with that Formstone-era fill soil. The Baltimore Community Farm Alliance has turned vacant lots across the city into productive gardens. Lexington Market, operating since 1782, connects Baltimore's food heritage to its garden-to-table present.
What This Means for Baltimore Gardeners
The average last spring frost in Baltimore is around March 30, and the average first fall frost arrives around November 8. That gives you approximately 223 frost-free days to work with.
That's a generous season. You have time for full-size tomatoes, long-season peppers, and even watermelons without the anxiety of racing the frost. Start warm-season seeds indoors 6-8 weeks before your last frost to hit the ground running. Fall planting is your second opportunity — garlic, kale, lettuce, and broccoli all go in 8-10 weeks before your first frost for harvest into late autumn.
These dates are based on NOAA 30-year Climate Normal data for the Baltimore area. Your actual frost dates could shift 2-3 weeks in either direction in any given year. Learn more about our data sources.
What to Grow in Baltimore
Baltimore's 223-day growing season is generous — long enough for two full growing windows (spring and fall) with warm-season crops between them. You can grow the full range of vegetables, herbs, and flowers with proper timing. Focus on heat-tolerant varieties for midsummer and cool-season crops for extended fall harvests. Recommended starting points: tomatoes, peppers, beans, cucumbers, squash, garlic, kale, and sunflowers.
See the full Maryland planting guide for all 40 plants: Maryland Planting Calendar. Or enter your zip code for exact planting dates personalized to Baltimore.
More About Zone 7B
Baltimore is in USDA Hardiness Zone 7B, which means average annual extreme minimum temperatures between 5°F to 10°F. View the full Zone 7B planting guide.
See the complete planting calendar for Maryland: Maryland Planting Calendar.
Other Cities in Maryland
Frequently Asked Questions
These dates are based on NOAA's 30-year Climate Normal data for the Baltimore area. They represent historical averages, not predictions. In any given year, the actual last frost could be 2-3 weeks earlier or later. Microclimates within Baltimore (urban heat islands, hilltops, low-lying valleys) can also shift your local frost dates by a week or more.
Cool-season crops go in 3-4 weeks before your last frost (March 30). Warm-season crops wait until 2 weeks after. You have time for a fall round too — plant cool-season crops again in late summer for harvest into autumn. Enter your zip code for exact dates.