When to Plant Dahlias in New Hampshire
In a typical New Hampshire location, plant outdoors May 10 – May 24. Across the state, the outdoor planting window starts as early as Apr 28 in Salem and as late as May 21 in Berlin.
Plant tubers 1-3 weeks after last frost once soil is warm (60F+); very frost-sensitive.
Dahlias Planting Dates by City
| City | Plant outdoors |
|---|---|
| Manchester | May 7 – May 21 |
| Nashua | May 7 – May 21 |
| Concord | May 15 – May 29 |
| East Concord | May 15 – May 29 |
| Derry Village | May 7 – May 21 |
| Dover | May 10 – May 24 |
| Rochester | May 7 – May 21 |
| Salem | Apr 28 – May 12 |
| Merrimack | May 7 – May 21 |
| Keene | May 21 – Jun 4 |
| Derry | May 7 – May 21 |
| Portsmouth | May 11 – May 25 |
| Bedford | Apr 28 – May 12 |
| Laconia | May 7 – May 21 |
| Lebanon | May 16 – May 30 |
| Windham | May 10 – May 24 |
| Claremont | May 21 – Jun 4 |
| Pelham | May 10 – May 24 |
| Somersworth | May 7 – May 21 |
| Londonderry | Apr 28 – May 12 |
| Durham | May 15 – May 29 |
| Hampton | May 11 – May 25 |
| Berlin | May 21 – Jun 4 |
| Exeter | May 11 – May 25 |
Showing the 24 most populous of 24 New Hampshire cities. Dates are estimates from each city's NOAA frost normals and university extension timing guidelines. See all New Hampshire cities.
Frequently Asked Questions
When should I plant dahlias in New Hampshire?
In a typical New Hampshire location, plant outdoors May 10 – May 24. Across the state, the outdoor planting window starts as early as Apr 28 in Salem and as late as May 21 in Berlin.
When is the last frost in New Hampshire?
The average last spring frost in New Hampshire ranges from April 21 in Salem to May 14 in Berlin, based on NOAA 1991–2020 climate normals.
How long do dahlias take to grow?
Dahlias typically take 90–120 days from planting to harvest. Plant tubers 1-3 weeks after last frost once soil is warm (60F+); very frost-sensitive.
Other Crops in New Hampshire
- Tomatoes
- Peppers
- Eggplant
- Cucumbers
- Zucchini
- Winter Squash
- Pumpkins
- Watermelon
- Cantaloupe
- Corn
- Green Beans
- Peas
- Lettuce
- Spinach
- Kale
- Arugula
- Swiss Chard
- Broccoli
- Cauliflower
- Cabbage
- Brussels Sprouts
- Carrots
- Beets
- Radishes
- Turnips
- Onions
- Garlic
- Potatoes
- Sweet Potatoes
- Asparagus
- Basil
- Cilantro
- Parsley
- Dill
- Oregano
- Thyme
- Sunflowers
- Zinnias
- Marigolds
- Cosmos
- Nasturtiums
When to plant dahlias in other states