When to plant in Kemp Mill, MD
USDA Zone 7bKemp Mill, Maryland frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Zone 7b means many perennials and even some tender shrubs overwinter in Kemp Mill, while your frost dates still decide when annuals go out.
The average first fall frost in Kemp Mill is now 5 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
BELTSVILLE · 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 Kemp Mill’s own odds, recorded at BELTSVILLE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 11 | Apr 24 | Apr 10 | Oct 7 | Oct 21 | Nov 2 |
| 32°F | May 1 | Apr 10 | Mar 27 | Oct 16 | Nov 1 | Nov 14 |
| 28°F | Apr 10 | Mar 29 | Mar 12 | Oct 29 | Nov 11 | Nov 30 |
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 Kemp Mill, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 13 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.
Kemp Mill planting FAQ
When is the last spring frost in Kemp Mill, MD?
Kemp Mill's average last spring frost falls near April 10 — 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 Kemp Mill, MD?
The first fall frost in Kemp Mill typically arrives around November 1 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Kemp Mill in?
Kemp Mill 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 Kemp Mill?
There are roughly 205 frost-free days in Kemp Mill (a moderate growing season), running from the average last frost around April 10 to the first fall frost near November 1.
When should I plant tomatoes in Kemp Mill?
In Kemp Mill, start tomato seeds indoors around February 13–February 27, then transplant seedlings outdoors around April 17 once the danger of frost has passed.
Never miss a window in Kemp Mill
An email when it’s time to start seeds, transplant, and sow — timed to Kemp Mill’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- White Oak · 3 km
- Wheaton · 3 km
- Glenmont · 4 km
- Colesville · 4 km
- Silver Spring · 4 km
- Calverton · 6 km
- Langley Park · 7 km
- Adelphi · 7 km
Frost dates recorded at BELTSVILLE, 8 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 Kemp Mill, MD — Frost Dates & Zone 7b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00180700. Retrieved from https://blissgarden.com/maryland/kemp-mill.