When to plant in Aspen Hill, MD
USDA Zone 7bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Aspen Hill, Maryland — all computed from Aspen Hill's nearest NOAA weather station.
Zone 7b means many perennials and even some tender shrubs overwinter in Aspen Hill, while your frost dates still decide when annuals go out.
Frost probability
ROCKVILLE 1 NE · 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 Aspen Hill’s own odds, recorded at ROCKVILLE 1 NE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 5 | Apr 16 | Mar 31 | Oct 12 | Oct 25 | Nov 7 |
| 32°F | Apr 15 | Apr 1 | Mar 19 | Oct 24 | Nov 6 | Nov 21 |
| 28°F | Apr 4 | Mar 22 | Mar 5 | Nov 5 | Nov 19 | Dec 6 |
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 Aspen Hill, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 16 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.
Aspen Hill planting FAQ
When is the last spring frost in Aspen Hill, MD?
On average, the last spring frost in Aspen Hill is around April 1 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Aspen Hill, MD?
In Aspen Hill, the first 32°F freeze of fall lands around November 6 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Aspen Hill in?
Aspen Hill 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 Aspen Hill?
There are roughly 219 frost-free days in Aspen Hill (a long growing season), running from the average last frost around April 1 to the first fall frost near November 6.
When should I plant tomatoes in Aspen Hill?
In Aspen Hill, start tomato seeds indoors around February 4–February 18, then transplant seedlings outdoors around April 8 once the danger of frost has passed.
Never miss a window in Aspen Hill
An email when it’s time to start seeds, transplant, and sow — timed to Aspen Hill’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Glenmont · 4 km
- Wheaton · 5 km
- Olney · 6 km
- Rockville · 6 km
- Redland · 7 km
- North Bethesda · 7 km
- Colesville · 7 km
- Cloverly · 8 km
Frost dates recorded at ROCKVILLE 1 NE, 6 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 Aspen Hill, MD — Frost Dates & Zone 7b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00187705. Retrieved from https://blissgarden.com/maryland/aspen-hill.