Maryland planting calendar

When to plant potatoes in Maryland — sow, transplant & harvest dates

Maryland is mostly USDA zone 7b (range 6a-8a). Dates below are derived from potatoes's frost tolerance and Maryland's frost window — not generic national averages.

Potatoes planting timetable for Maryland

Stage	When in Maryland	Anchor
Direct-sow outside	late March (March 25)	21 days before the last frost (mid-April)
First harvest (estimate)	mid-June (June 18)	~85 days from direct sow

Dates are state-wide averages for the dominant zone. Local microclimates — elevation, urban heat, coastal moderation — can shift the window by 1-2 weeks. Use the frost-date calculator for a date tuned to your town.

Why Maryland's climate shifts the potatoes dates

Maryland's last spring frost averages mid-April and first fall frost late October, which sets the whole planting clock. Maryland spans cool western mountains to a mild Chesapeake tidewater, giving a long, varied mid-Atlantic season. Sow early — potatoes bolt once daytime temperatures hold above 24 °C, so the earlier they go in, the longer the harvest.

Potatoes are planted as certified seed potatoes (not supermarket tubers) 2-4 weeks before the last spring frost, once soil temperature reaches at least 7 °C; they tolerate light frost in the ground but emerging foliage is killed below -2 °C, so hill soil over any shoots that break through during a late freeze. In zones 9-11 potatoes are a winter or early-spring crop, planted in late January-February to mature before summer heat forces them dormant. Days-to-harvest ranges from 70 days for early/new-potato types to 110-120 days for maincrop storage varieties.

Frost-risk note

Don't plant before mid-April — a hard freeze can still set young plants back. In the western Appalachian panhandle near Oakland (zone 6a) the safe date runs a week or two later.

Regional variation within Maryland

the western Appalachian panhandle near Oakland (zone 6a) runs roughly 1-2 weeks behind the state average; the Chesapeake and Atlantic shoreline (zone 8a) can plant 1-2 weeks earlier.

Baltimore — USDA zone 8a
Annapolis — USDA zone 7b
Rockville — USDA zone 7b
Frederick — USDA zone 7a
Ocean City — USDA zone 8a

What else to plant in Maryland around then

The same early window suits peas, lettuce, spinach, and onion sets.

Quick-grow guide

Sun: Full sun — 6-8 hours direct.
Soil temperature for germination: Soil 7-18 °C (45-65 °F) at planting.
Spacing: 10-15 inches (25-38 cm) between plants.
Days to harvest: ~85 days from planting out.

Frequently asked questions

When is the best time to plant potatoes in Maryland?

In Maryland (mostly USDA zone 7b), direct-sow potatoes late March (before the last frost, mid-April), and harvest from mid-June. Potatoes are half-hardy — young plants shrug off a light frost but not a hard freeze, so sowing can start a couple of weeks before the last spring frost.

What USDA zone is Maryland?

Most of Maryland sits in USDA hardiness zone 7b, with the state spanning roughly 6a-8a from the western Appalachian panhandle near Oakland (zone 6a) to the Chesapeake and Atlantic shoreline (zone 8a). The last spring frost averages mid-April and the first fall frost late October.

Can you grow potatoes in Maryland?

Yes. Maryland's dominant zone 7b supports potatoes — the key is timing. Potatoes are half-hardy — young plants shrug off a light frost but not a hard freeze, so sowing can start a couple of weeks before the last spring frost.

Does the planting date change across Maryland?

the western Appalachian panhandle near Oakland (zone 6a) runs roughly 1-2 weeks behind the state average; the Chesapeake and Atlantic shoreline (zone 8a) can plant 1-2 weeks earlier.

What else can I plant in Maryland around the same time?

The same early window suits peas, lettuce, spinach, and onion sets.

Source and methodology

State zone spans from the USDA Plant Hardiness Zone Map (2023); frost-date averages from NOAA Climate Data Online. Hot-state two-season timing cross-checked against the UF/IFAS Florida Gardening Calendar and the University of Arizona Cooperative Extension planting calendar. Curated by the Growli editorial team.