When to plant in Rosaryville, MD
USDA Zone 7bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Rosaryville, Maryland — all computed from Rosaryville's nearest NOAA weather station.
Zone 7b means many perennials and even some tender shrubs overwinter in Rosaryville, while your frost dates still decide when annuals go out.
Frost probability
UPPER MARLBORO 3 NNW · 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 Rosaryville’s own odds, recorded at UPPER MARLBORO 3 NNW.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 12 | Apr 24 | Apr 8 | Oct 5 | Oct 19 | Nov 1 |
| 32°F | Apr 24 | Apr 9 | Mar 27 | Oct 14 | Oct 29 | Nov 11 |
| 28°F | Apr 12 | Mar 30 | Mar 14 | Oct 27 | Nov 10 | Nov 25 |
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 Rosaryville, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 20 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.
Rosaryville planting FAQ
When is the last spring frost in Rosaryville, MD?
Rosaryville's average last spring frost falls near April 9 — 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 Rosaryville, MD?
Expect Rosaryville's first fall frost near October 29 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Rosaryville in?
Rosaryville 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 Rosaryville?
There are roughly 203 frost-free days in Rosaryville (a moderate growing season), running from the average last frost around April 9 to the first fall frost near October 29.
When should I plant tomatoes in Rosaryville?
In Rosaryville, start tomato seeds indoors around February 12–February 26, then transplant seedlings outdoors around April 16 once the danger of frost has passed.
Never miss a window in Rosaryville
An email when it’s time to start seeds, transplant, and sow — timed to Rosaryville’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Marlton · 4 km
- Clinton · 7 km
- Westphalia · 8 km
- Camp Springs · 9 km
- Forestville · 10 km
- Brandywine · 11 km
- Friendly · 12 km
- Suitland · 12 km
Frost dates recorded at UPPER MARLBORO 3 NNW, 11 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 Rosaryville, MD — Frost Dates & Zone 7b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00189070. Retrieved from https://blissgarden.com/maryland/rosaryville.