When to plant in Chillum, MD
USDA Zone 7bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Chillum, Maryland — all computed from Chillum's nearest NOAA weather station.
Zone 7b means many perennials and even some tender shrubs overwinter in Chillum, while your frost dates still decide when annuals go out.
The average first fall frost in Chillum is now 5 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
NATL ARBORETUM DC · 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 Chillum’s own odds, recorded at NATL ARBORETUM DC.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 28 | Apr 10 | Mar 29 | Oct 14 | Oct 29 | Nov 10 |
| 32°F | Apr 11 | Mar 29 | Mar 15 | Oct 26 | Nov 8 | Nov 23 |
| 28°F | Mar 31 | Mar 17 | Mar 2 | Nov 6 | Nov 20 | Dec 7 |
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 Chillum, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 12 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.
Chillum planting FAQ
When is the last spring frost in Chillum, MD?
On average, the last spring frost in Chillum is around March 29 (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 Chillum, MD?
Expect Chillum's first fall frost near November 8 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Chillum in?
Chillum 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 Chillum?
There are roughly 224 frost-free days in Chillum (a long growing season), running from the average last frost around March 29 to the first fall frost near November 8.
When should I plant tomatoes in Chillum?
In Chillum, start tomato seeds indoors around February 1–February 15, then transplant seedlings outdoors around April 5 once the danger of frost has passed.
Never miss a window in Chillum
An email when it’s time to start seeds, transplant, and sow — timed to Chillum’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Hyattsville · 2 km
- Takoma Park · 3 km
- Langley Park · 3 km
- Adelphi · 4 km
- College Park · 5 km
- Silver Spring · 5 km
- East Riverdale · 6 km
- Washington · 8 km
Frost dates recorded at NATL ARBORETUM DC, 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 Chillum, MD — Frost Dates & Zone 7b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00186350. Retrieved from https://blissgarden.com/maryland/chillum.