When to plant in Laconia, NH
USDA Zone 5bEverything below — frost dates, hardiness zone, and what to plant when in Laconia, New Hampshire — is derived from the closest NOAA station with complete climate normals.
Zone 5b means Laconia sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
LAKEPORT 2 · 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 Laconia’s own odds, recorded at LAKEPORT 2.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 23 | May 10 | Apr 30 | Sep 25 | Oct 5 | Oct 19 |
| 32°F | May 13 | Apr 30 | Apr 19 | Oct 4 | Oct 18 | Nov 3 |
| 28°F | Apr 30 | Apr 17 | Apr 6 | Oct 16 | Nov 1 | Nov 13 |
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 Laconia, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 18 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.
Laconia planting FAQ
When is the last spring frost in Laconia, NH?
On average, the last spring frost in Laconia is around April 30 (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 Laconia, NH?
The first fall frost in Laconia typically arrives around October 18 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Laconia in?
Laconia is in USDA hardiness zone 5b. In zone 5b, winters are cold — pick cold-hardy varieties and protect tender crops.
How long is the growing season in Laconia?
There are roughly 171 frost-free days in Laconia (a moderate growing season), running from the average last frost around April 30 to the first fall frost near October 18.
When should I plant tomatoes in Laconia?
In Laconia, start tomato seeds indoors around March 5–March 19, then transplant seedlings outdoors around May 7 once the danger of frost has passed.
Never miss a window in Laconia
An email when it’s time to start seeds, transplant, and sow — timed to Laconia’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Concord · 39 km
- Rochester · 51 km
- Somersworth · 60 km
- Sanford · 61 km
- Lebanon · 62 km
- Dover · 65 km
- Manchester · 66 km
- Durham · 66 km
Frost dates recorded at LAKEPORT 2, 3 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 Laconia, NH — Frost Dates & Zone 5b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00274480. Retrieved from https://blissgarden.com/new-hampshire/laconia.