When to plant in Great Falls, VA
USDA Zone 7bGreat Falls, Virginia frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
In zone 7b, Great Falls supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
VIENNA · 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 Great Falls’s own odds, recorded at VIENNA.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 10 | Apr 25 | Apr 11 | Oct 7 | Oct 19 | Nov 1 |
| 32°F | Apr 28 | Apr 14 | Mar 30 | Oct 17 | Oct 29 | Nov 11 |
| 28°F | Apr 16 | Apr 2 | Mar 18 | Oct 26 | Nov 8 | Nov 23 |
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 Great Falls, 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.
Great Falls planting FAQ
When is the last spring frost in Great Falls, VA?
On average, the last spring frost in Great Falls is around April 14 (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 Great Falls, VA?
The first fall frost in Great Falls typically arrives around October 29 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Great Falls in?
Great Falls 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 Great Falls?
Great Falls has about 198 frost-free days — a moderate growing season — between the average last spring frost (April 14) and first fall frost (October 29).
When should I plant tomatoes in Great Falls?
For Great Falls, sow tomatoes indoors about February 17–March 3 and move the seedlings out around April 21, after the last spring frost.
Never miss a window in Great Falls
An email when it’s time to start seeds, transplant, and sow — timed to Great Falls’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Sugarland Run · 6 km
- Lowes Island · 6 km
- Dranesville · 6 km
- Travilah · 7 km
- Reston · 8 km
- Cascades · 8 km
- Wolf Trap · 9 km
- Herndon · 9 km
Frost dates recorded at VIENNA, 13 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 Great Falls, VA — Frost Dates & Zone 7b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00448737. Retrieved from https://blissgarden.com/virginia/great-falls.