Frost Dates for Baltimore, MD 21215

Last spring frost April 11 · First fall frost October 29 · 201 frost-free days · USDA Zone 7b

Frost probability for 21215

Frost10%50%90%
Spring (last frost)April 22April 11March 31
Fall (first frost)October 11October 29November 11

Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (19.2 km away); the 50% date is the median year.

Frost dates by ZIP code in Baltimore, MD

ZIPLast spring frost (50%)First fall frost (50%)Zone
21215April 11October 297b
21206April 11October 297b
21224April 11October 298a
21229April 11October 297b
21218April 11October 297b
21212April 11October 297b
21230April 11October 298a
21217April 11October 297b
21209April 11October 297b
21216April 11October 297b
21213April 11October 298a
21239April 11October 297b
21214April 11October 297b
21202April 11October 298a
21223April 11October 297b
21201April 11October 298a
21211April 11October 297b
21231April 11October 298a
21210April 11October 297b
21205April 11October 298a
21250April 11October 297b
21251April 11October 29Zone 6b
21233April 11October 298a
21240April 11October 297b
21287April 11October 29Zone 6b

Month by month in Baltimore

MonthWhat to do
JanuaryPlan your garden layout and order seeds. Research varieties suited to your frost dates.
FebruaryStart peppers and eggplant indoors 8–10 weeks before your last frost (around April 11). Start tomatoes about two weeks later, 6–8 weeks before last frost.
MarchStart herbs, basil, and squash indoors (4–6 weeks before frost). Direct sow peas, spinach, and lettuce if soil is workable.
AprilLast frost around April 11. Transplant cold-hardy crops (broccoli, kale, cabbage). Harden off tomato and pepper seedlings.
MayFrost has passed. Transplant tomatoes, peppers, and basil outdoors. Direct sow beans, cucumbers, squash, and zucchini.
JuneSuccession plant lettuce and greens. Keep beds weeded and watered consistently.
JulyHarvest regularly to encourage production. Monitor for pests and disease.
AugustMidsummer: harvest beans, zucchini, cucumbers. Start brassica seeds indoors for fall.
SeptemberFirst fall frost approaching (around October 29). Transplant fall brassicas. Sow spinach, arugula, and radishes.
OctoberFirst frost around October 29. Harvest tomatoes and peppers before frost. Cover cold-hardy crops with row covers to extend the season.
NovemberHarvest remaining cold-hardy crops: kale, carrots, and beets. Plant garlic bulbs for next year.
DecemberClean up spent plants. Add compost to beds. Rest, review, and plan next year's garden.

What grows in a 201-day season

Frequently Asked Questions

What is the last frost date for Baltimore, MD (ZIP 21215)?

The median last spring frost date for Baltimore, MD (ZIP code 21215) is around April 11. This is the 50th-percentile date — meaning half of all years see frost end before this date. Use the 10% and 90% dates to understand the full range of risk in your area.

What is the first fall frost date in Baltimore, MD?

The median first fall frost date for Baltimore, MD is around October 29. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses.

How long is the growing season in Baltimore, MD?

The frost-free growing season in Baltimore is about 201 days. This window — from your last spring frost to your first fall frost — is when warm-season vegetables thrive. Cold-hardy crops like kale, spinach, and peas can extend your season by weeks on either side.

What USDA hardiness zone is Baltimore, MD?

Based on frost date patterns, Baltimore falls approximately in 7b. USDA hardiness zones are determined by average annual minimum winter temperatures and guide both plant selection and planting timing for your location.

When should I start tomatoes indoors in Baltimore, MD?

Start tomato seeds indoors 6–8 weeks before your last frost date (around April 11). For Baltimore, that's roughly February 15 to February 29. Transplant outdoors 1–2 weeks after your last frost.

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