When to plant in Havre de Grace, MD
USDA Zone 7bHavre de Grace, Maryland 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, Havre de Grace supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
ABERDEEN PHILLIPS FLD · 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 Havre de Grace’s own odds, recorded at ABERDEEN PHILLIPS FLD.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 12 | Apr 27 | Apr 9 | Oct 5 | Oct 19 | Nov 1 |
| 32°F | Apr 30 | Apr 10 | Mar 27 | Oct 14 | Oct 30 | Nov 12 |
| 28°F | Apr 12 | Mar 29 | Mar 13 | Oct 28 | Nov 10 | Nov 27 |
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 Havre de Grace, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 28 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.
Havre de Grace planting FAQ
When is the last spring frost in Havre de Grace, MD?
Havre de Grace'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 Havre de Grace, MD?
Expect Havre de Grace's first fall frost near October 30 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Havre de Grace in?
Havre de Grace 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 Havre de Grace?
Havre de Grace has about 203 frost-free days — a moderate growing season — between the average last spring frost (April 10) and first fall frost (October 30).
When should I plant tomatoes in Havre de Grace?
For Havre de Grace, sow tomatoes indoors about February 13–February 27 and move the seedlings out around April 17, after the last spring frost.
Never miss a window in Havre de Grace
An email when it’s time to start seeds, transplant, and sow — timed to Havre de Grace’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Aberdeen · 6 km
- Bel Air South · 17 km
- Bel Air · 20 km
- Edgewood · 21 km
- Bel Air North · 22 km
- Joppatowne · 25 km
- Elkton · 26 km
- Fallston · 28 km
Frost dates recorded at ABERDEEN PHILLIPS FLD, 10 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 Havre de Grace, MD — Frost Dates & Zone 7b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00013701. Retrieved from https://blissgarden.com/maryland/havre-de-grace.