Frost Dates & Planting Calendar for Lanham-Seabrook, MD

The average first fall frost in Lanham-Seabrook, MD is October 22, and the average last spring frost is April 22, giving a growing season of about 183 days.

Plan your garden around Lanham-Seabrook, MD's typical frost-free growing season, using NOAA climate normals and a 42-crop planting calendar built for this location.

Last Spring Frost

April 22

Safe May 9 Typical Apr 22 Risky Apr 3

First Fall Frost

October 22

Safe Oct 7 Typical Oct 22 Risky Nov 6

Growing Season

183 days

Typical last frost to typical first frost.

USDA Hardiness Zone

Zone 7b

Mild winters and a long growing season, room for both cool- and warm-season crops.

Data: NOAA station GLENN DALE BELL STN, MD US, 4.1 km away.

— days until the typical last spring frost

How Lanham-Seabrook Compares

Lanham-Seabrook's typical last spring frost (Apr 22) comes later than in 93% of the 151 Maryland cities we track.
Its 183-day growing season is 34 days shorter than the Maryland median of 217 days.
Compared with Greenbelt (5 km away), Lanham-Seabrook's last spring frost comes 12 days later than Greenbelt's, and its first fall frost arrives 10 days earlier.
July is the warmest month (average high 89°F) and January the coldest (average low 22°F).

Monthly Temperatures

Avg. high Avg. temp Avg. low

Planting Calendar

Vegetables
Crop	Start indoors	Direct sow	Transplant	Fall planting	Maturity	Notes
Tomato	Feb 25 – Mar 11	—	Apr 29 – May 6	—	60–85 days	Start indoors 6-8 weeks before last frost; transplant out 1-2 weeks after last frost once soil has warmed.
Pepper	Feb 11 – Feb 25	—	Apr 29 – May 13	—	60–90 days	Slow to germinate; start indoors 8-10 weeks before last frost. Transplant only once nights stay above 55F, 1-3 weeks after last frost.
Eggplant	Feb 11 – Feb 25	—	May 6 – May 13	—	65–85 days	Warm-season crop, similar timing to pepper; needs consistently warm soil (65F+) to transplant.
Cucumber	Mar 25 – Apr 1	Apr 29 – May 6	Apr 29 – May 6	—	50–65 days	Can be started indoors 3-4 weeks before transplanting, or direct-sown 1-2 weeks after last frost once soil is warm.
Zucchini	Apr 1 – Apr 8	Apr 29 – May 13	Apr 29 – May 6	—	45–55 days	Fast-growing squash; direct sow 1-3 weeks after last frost, or start indoors 2-3 weeks early for a head start.
Winter Squash	Mar 25 – Apr 1	Apr 29 – May 13	Apr 29 – May 6	—	80–110 days	Long season; direct sow after soil warms, or start indoors 3-4 weeks before last frost in short-season climates.
Pumpkin	—	Apr 29 – May 13	—	—	90–120 days	Direct sow 1-3 weeks after last frost; back-time from your first fall frost so the 90-120 day maturity window lands before it.
Watermelon	Mar 25 – Apr 1	—	May 6 – May 13	—	70–90 days	Needs warm soil (65F+); start indoors 3-4 weeks before last frost, transplant 2-3 weeks after last frost.
Cantaloupe	Mar 25 – Apr 1	—	May 6 – May 13	—	70–90 days	Same warm-soil requirements as watermelon; avoid disturbing roots when transplanting.
Corn	—	Apr 22 – May 6	—	—	60–100 days	Direct sow at last frost to 2 weeks after, once soil reaches 60F; does not transplant well. Succession sow every 2 weeks.
Green Bean	—	Apr 22 – May 6	—	—	50–65 days	Direct sow at last frost to 2 weeks after, once soil has warmed; frost-tender, do not rush.
Pea	—	Mar 11 – Mar 25	—	—	55–70 days	Cold-hardy; direct sow 4-6 weeks before last frost as soon as soil can be worked.
Lettuce	—	Mar 25 – Apr 8	—	Aug 27 – Sep 10	45–60 days	Cold-hardy; direct sow 2-4 weeks before last frost. Also transplantable from indoor starts.
Spinach	—	Mar 11 – Mar 25	—	Aug 27 – Sep 10	40–50 days	Very cold-hardy; direct sow 4-6 weeks before last frost as soon as soil can be worked.
Kale	—	Mar 25 – Apr 8	—	Aug 13 – Aug 27	50–65 days	Cold-hardy; direct sow 2-4 weeks before last frost or start indoors for earlier transplants.
Arugula	—	Mar 25 – Apr 8	—	Sep 10 – Sep 17	30–40 days	Fast-growing, cold-tolerant green; direct sow 2-4 weeks before last frost, succession sow every 2-3 weeks.
Swiss Chard	—	Apr 1 – Apr 15	—	—	50–60 days	Fairly cold-hardy; direct sow 1-3 weeks before last frost. Tolerates light frost in fall too.
Broccoli	Mar 4 – Mar 18	—	Apr 1 – Apr 8	Aug 20 – Aug 27	55–80 days	Start indoors 5-7 weeks before last frost; transplant out 2-3 weeks before last frost (hardens off to light frost).
Cauliflower	Mar 4 – Mar 18	—	Apr 8 – Apr 15	Aug 13 – Aug 20	55–85 days	Fussier than broccoli about temperature swings; start indoors 5-7 weeks before last frost, transplant 1-2 weeks before last frost.
Cabbage	Mar 4 – Mar 18	—	Mar 25 – Apr 8	Aug 13 – Aug 27	60–100 days	Cold-hardy; start indoors 5-7 weeks before last frost, transplant 2-4 weeks before last frost.
Brussels Sprouts	Mar 4 – Mar 18	—	Apr 1 – Apr 15	—	90–110 days	Long-season crop best timed to mature after a light fall frost for sweetest flavor; start indoors 5-7 weeks before last frost.
Carrot	—	Mar 25 – Apr 8	—	Jul 30 – Aug 13	60–80 days	Direct sow only (does not transplant); sow 2-4 weeks before last frost, as soon as soil can be worked.
Beet	—	Mar 25 – Apr 8	—	Aug 13 – Aug 27	50–65 days	Direct sow 2-4 weeks before last frost; tolerates light frost.
Radish	—	Mar 18 – Apr 1	—	Sep 10 – Sep 24	22–30 days	Very fast and cold-hardy; direct sow 3-5 weeks before last frost, as soon as soil can be worked.
Turnip	—	Mar 25 – Apr 8	—	Aug 13 – Aug 27	40–60 days	Cold-hardy; direct sow 2-4 weeks before last frost.
Onion	Feb 11 – Feb 25	—	Mar 25 – Apr 8	—	90–120 days	Start seeds indoors 8-10 weeks before last frost (or use sets/transplants); set out 2-4 weeks before last frost, very cold-tolerant as seedlings.
Garlic	—	—	—	Sep 24 – Oct 8	240–270 days	Fall-planted crop only; not planted in spring in most climates.
Potato	—	Mar 25 – Apr 8	—	—	70–120 days	Plant seed potatoes 2-4 weeks before last frost, as soon as soil can be worked and is above 45F; light frost on emerging foliage is usually tolerated.
Sweet Potato	—	—	May 6 – May 20	—	90–120 days	Set out slips 2-4 weeks after last frost once soil is thoroughly warm (65F+); very frost/cold sensitive.
Asparagus	—	—	Mar 25 – Apr 8	—	730–1095 days	Perennial; plant crowns 2-4 weeks before last frost as soon as soil can be worked. Takes 2-3 years to full production.

Herbs
Crop	Start indoors	Direct sow	Transplant	Fall planting	Maturity	Notes
Basil	Mar 11 – Mar 18	—	Apr 29 – May 6	—	50–70 days	Very frost/cold sensitive; start indoors 5-6 weeks before last frost, transplant only after all danger of frost (1-2 weeks after) and nights stay warm.
Cilantro	—	Apr 1 – Apr 15	—	Aug 27 – Sep 10	45–70 days	Cool-season, bolts in heat; direct sow 1-3 weeks before last frost, succession sow through spring.
Parsley	Feb 25 – Mar 11	—	Apr 8 – Apr 15	—	70–90 days	Slow to germinate; start indoors 6-8 weeks before last frost, transplant 1-2 weeks before last frost (biennial, cold-tolerant).
Dill	—	Apr 1 – Apr 15	—	—	40–60 days	Taprooted, does not transplant well; direct sow 1-3 weeks before last frost, succession sow through summer.
Oregano	Feb 25 – Mar 11	—	Apr 22 – Apr 29	—	80–90 days	Perennial herb; start indoors 6-8 weeks before last frost, transplant around/just after last frost date.
Thyme	Feb 25 – Mar 11	—	Apr 22 – Apr 29	—	85–95 days	Perennial herb, slow from seed; start indoors 6-8 weeks before last frost, transplant around/after last frost.

Flowers
Crop	Start indoors	Direct sow	Transplant	Fall planting	Maturity	Notes
Sunflower	—	Apr 29 – May 13	—	—	70–100 days	Direct sow 1-3 weeks after last frost once soil has warmed; taprooted, resents transplanting.
Zinnia	Mar 25 – Apr 1	Apr 29 – May 13	Apr 29 – May 6	—	60–70 days	Frost-tender; direct sow 1-3 weeks after last frost, or start indoors 3-4 weeks early for earlier blooms.
Marigold	Mar 11 – Mar 25	—	Apr 29 – May 6	—	45–60 days	Frost-tender; start indoors 4-6 weeks before last frost, transplant after all frost danger has passed.
Cosmos	Mar 25 – Apr 1	Apr 29 – May 13	Apr 29 – May 6	—	60–90 days	Easy from direct seed 1-3 weeks after last frost; can also start indoors 3-4 weeks early.
Nasturtium	—	Apr 29 – May 13	—	—	50–65 days	Frost-tender, resents root disturbance; direct sow 1-3 weeks after last frost once soil has warmed.
Dahlia	—	—	Apr 29 – May 13	—	90–120 days	Plant tubers 1-3 weeks after last frost once soil is warm (60F+); very frost-sensitive.

Date ranges are estimates based on university extension guidelines and this city's NOAA frost normals — not a guarantee. Scroll to see all columns on narrow screens.

Frequently Asked Questions

When is the last frost in Lanham-Seabrook, MD?

Based on 1991–2020 NOAA climate normals for the GLENN DALE BELL STN, MD US station, the last spring frost in Lanham-Seabrook typically falls around April 22. A cautious gardener might wait until May 9 (only a 10% chance of a later frost), while April 3 marks an earlier, higher-risk planting date.

When is the first frost in Lanham-Seabrook, MD in fall?

The first fall frost in Lanham-Seabrook typically arrives around October 22. To stay safe, assume frost could start as early as October 7; in milder years it can hold off until November 6.

How long is the growing season in Lanham-Seabrook, MD?

Lanham-Seabrook's average frost-free growing season is about 183 days, running from the typical last spring frost (April 22) to the typical first fall frost (October 22).

What USDA hardiness zone is Lanham-Seabrook, MD in?

Lanham-Seabrook, MD is in USDA plant hardiness zone 7b, per the USDA's 2023 Plant Hardiness Zone Map. Mild winters and a long growing season, room for both cool- and warm-season crops.