When to plant in Glenn Dale, MD
USDA Zone 7bEverything below — frost dates, hardiness zone, and what to plant when in Glenn Dale, Maryland — is derived from the closest NOAA station with complete climate normals.
In zone 7b, Glenn Dale supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
GLENN DALE BELL STN · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Glenn Dale’s own odds, recorded at GLENN DALE BELL STN.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 20 | May 3 | Apr 18 | Sep 30 | Oct 12 | Oct 26 |
| 32°F | May 9 | Apr 22 | Apr 3 | Oct 7 | Oct 22 | Nov 6 |
| 28°F | Apr 30 | Apr 7 | Mar 23 | Oct 16 | Nov 1 | Nov 15 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Glenn Dale, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 14 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Glenn Dale planting FAQ
When is the last spring frost in Glenn Dale, MD?
Glenn Dale's average last spring frost falls near April 22 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Glenn Dale, MD?
The first fall frost in Glenn Dale typically arrives around October 22 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Glenn Dale in?
Glenn Dale is in USDA hardiness zone 7b. In zone 7b, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Glenn Dale?
Glenn Dale has about 183 frost-free days — a moderate growing season — between the average last spring frost (April 22) and first fall frost (October 22).
When should I plant tomatoes in Glenn Dale?
For Glenn Dale, sow tomatoes indoors about February 25–March 11 and move the seedlings out around April 29, after the last spring frost.
Never miss a window in Glenn Dale
An email when it’s time to start seeds, transplant, and sow — timed to Glenn Dale’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Lanham · 4 km
- Seabrook · 4 km
- Mitchellville · 5 km
- Bowie · 6 km
- New Carrollton · 7 km
- Greenbelt · 7 km
- Lake Arbor · 9 km
- South Laurel · 9 km
Frost dates recorded at GLENN DALE BELL STN, 2 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Glenn Dale, MD — Frost Dates & Zone 7b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00183675. Retrieved from https://blissgarden.com/maryland/glenn-dale.