Frost Dates for Silver Spring, MD 20906

Last spring frost April 16 · First fall frost October 22 · 189 frost-free days · USDA Zone 7b

Frost probability for 20906

Frost10%50%90%
Spring (last frost)May 1April 16March 26
Fall (first frost)October 9October 22November 9

Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (8.2 km away); the 50% date is the median year.

Frost dates by ZIP code in Silver Spring, MD

ZIPLast spring frost (50%)First fall frost (50%)Zone
20906April 16October 227b
20904April 9October 267b
20902April 16October 227b
20910April 15October 237b
20901April 9October 267b
20903April 9October 267b
20905April 18October 227b

Month by month in Silver Spring

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 16). 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 16. 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 22). Transplant fall brassicas. Sow spinach, arugula, and radishes.
OctoberFirst frost around October 22. 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 189-day season

Frequently Asked Questions

What is the last frost date for Silver Spring, MD (ZIP 20906)?

The median last spring frost date for Silver Spring, MD (ZIP code 20906) is around April 16. 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 Silver Spring, MD?

The median first fall frost date for Silver Spring, MD is around October 22. 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 Silver Spring, MD?

The frost-free growing season in Silver Spring is about 189 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 Silver Spring, MD?

Based on frost date patterns, Silver Spring 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 Silver Spring, MD?

Start tomato seeds indoors 6–8 weeks before your last frost date (around April 16). For Silver Spring, that's roughly February 20 to March 5. Transplant outdoors 1–2 weeks after your last frost.

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