Frost Dates for Concord, NH 03303
Concord has 2 ZIP codes. The Concord, NH frost page lists all of them with their dates.
Last spring frost May 20 · First fall frost September 21 · 124 frost-free days · USDA Zone 5b
ZIP 03303 has about 16,600 people, one of 2 ZIP codes in Concord.
Moderate season: 124 frost-free days. Spring frost risk spans May 3–June 6 (34 days). Fall frost risk spans September 8–October 5 (27 days).
Frost probability for 03303
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | June 6 | May 20 | May 3 |
| Fall (first frost) | September 8 | September 21 | October 5 |
Dates come from NOAA 1971–2000 freeze probabilities at CONCORD ASOS (17.2 km away); the 50% date is the median year.
Which crops fit a 124-day season in Concord
In Concord (124 frost-free days, a moderate season), 35 of 56 planner crops fit outright, 15 get two plantings, 5 need an indoor start, 1 crop is perennial.
| Crop | Start indoors | Plant out / sow | Days you have | Verdict | Last sow date |
|---|---|---|---|---|---|
| Tomato | Apr 15 | Jun 3–Jun 10 | 82 | fits: 80 days to maturity, 82 available after Jun 3. | — |
| Pepper | Apr 8 | Jun 3–Jun 10 | 82 | fits: 75 days to maturity, 82 available after Jun 3. | — |
| Lettuce | Mar 25 | Apr 22–Apr 29 | 159 | two-plantings: Plant Apr 22 and again by Jul 31; both mature before Sep 28. | Jul 31 |
| Carrots | — | Apr 29–May 6 | 166 | fits: 70 days to maturity, 166 available after Apr 29. | Jul 20 |
| Cucumber | Apr 29 | Jun 3–Jun 10 | 96 | fits: 60 days to maturity, 96 available after Jun 3. | Jun 25 |
| Beans | — | May 27–Jun 10 | 110 | fits: 60 days to maturity, 110 available after May 27. | Jul 2 |
| Peas | — | Mar 25–Jun 3 | 187 | fits: 65 days to maturity, 187 available after Mar 25. | Jul 11 |
| Zucchini | May 6 | Jun 3–Jun 10 | 96 | fits: 55 days to maturity, 96 available after Jun 3. | Jun 30 |
| Onion | Feb 25 | Apr 22–May 6 | 159 | fits: 100 days to maturity, 159 available after Apr 22. | — |
| Spinach | — | Mar 25–May 13 | 201 | two-plantings: Plant Mar 25 and again by Aug 19; both mature before Oct 12. | Aug 19 |
| Kale | Mar 11 | Apr 22–May 6 | 173 | two-plantings: Plant Apr 22 and again by Aug 4; both mature before Oct 12. | Aug 4 |
| Broccoli | Mar 25 | Apr 22–May 6 | 159 | fits: 80 days to maturity, 159 available after Apr 22. | Jun 26 |
| Cabbage | Mar 25 | Apr 22–May 6 | 173 | fits: 70 days to maturity, 173 available after Apr 22. | Jul 20 |
| Radish | — | Mar 25–Jun 17 | 187 | two-plantings: Plant Mar 25 and again by Aug 20; both mature before Sep 28. | Aug 20 |
| Beets | — | Mar 25–Jun 17 | 187 | two-plantings: Plant Mar 25 and again by Jul 21; both mature before Sep 28. | Jul 21 |
| Potatoes | — | May 6–May 13 | 145 | fits: 90 days to maturity, 145 available after May 6. | — |
| Garlic | — | Sep 21 | 229 | overwinter: Plant Sep 21 to Oct 12; harvest the following summer. | Oct 12 |
| Strawberry | — | Apr 15–Jun 10 | 180 | perennial: A perennial: plant Apr 15; it fruits from the following year and keeps producing for several years. | — |
| Corn | Apr 22 | May 27–Jun 3 | 96 | fits: 75 days to maturity, 96 available after May 27. | Jun 3 |
| Pumpkin | May 6 | Jun 3–Jun 3 | 89 | head-start: Even planted out Jun 3, the outdoor season is about 11 days short; choose an early variety or grow under cover. | — |
| Cauliflower | Apr 8 | May 13–May 27 | 138 | fits: 75 days to maturity, 138 available after May 13. | Jul 1 |
| Swiss Chard | Mar 25 | May 6–May 6 | 145 | two-plantings: Plant May 6 and again by Jul 21; both mature before Sep 28. | Jul 21 |
| Arugula | — | Mar 25–Jun 17 | 201 | two-plantings: Plant Mar 25 and again by Aug 19; both mature before Oct 12. | Aug 19 |
| Brussel Sprouts | Mar 25 | Apr 22–May 6 | 173 | fits: 100 days to maturity, 173 available after Apr 22. | Jun 20 |
| Butternut Squash | May 6 | Jun 3–Jun 10 | 89 | head-start: Even planted out Jun 3, the outdoor season is about 11 days short; choose an early variety or grow under cover. | — |
| Eggplant | Apr 1 | Jun 3–Jun 10 | 82 | fits: 70 days to maturity, 82 available after Jun 3. | — |
| Okra | Apr 22 | May 27–Jun 3 | 103 | fits: 55 days to maturity, 103 available after May 27. | Jun 30 |
| Basil | Apr 15 | Jun 10–Jun 10 | 89 | fits: 60 days to maturity, 89 available after Jun 10. | Jun 25 |
| Cilantro | — | Apr 22–May 13 | 159 | two-plantings: Plant Apr 22 and again by Jul 26; both mature before Sep 28. | Jul 26 |
| Parsley | Mar 11 | May 27–Jun 3 | 124 | fits: 70 days to maturity, 124 available after May 27. | Jul 6 |
| Celery | Mar 11 | May 27–Jun 10 | 124 | fits: 120 days to maturity, 124 available after May 27. | — |
| Scallions | Mar 11 | Apr 22–May 6 | 173 | two-plantings: Plant Apr 22 and again by Jul 30; both mature before Oct 12. | Jul 30 |
| Turnip | — | Apr 22–May 6 | 173 | two-plantings: Plant Apr 22 and again by Aug 9; both mature before Oct 12. | Aug 9 |
| Kohlrabi | — | Apr 8–Apr 22 | 187 | two-plantings: Plant Apr 8 and again by Aug 4; both mature before Oct 12. | Aug 4 |
| Bok Choy | Apr 22 | May 13–May 20 | 138 | two-plantings: Plant May 13 and again by Jul 31; both mature before Sep 28. | Jul 31 |
| Collards | Mar 11 | Apr 22–May 6 | 173 | two-plantings: Plant Apr 22 and again by Jul 30; both mature before Oct 12. | Jul 30 |
| Cantaloupe | May 6 | Jun 3–Jun 10 | 82 | head-start: Even planted out Jun 3, the outdoor season is about 3 days short; choose an early variety or grow under cover. | — |
| Chives | Feb 25 | May 27–Jun 3 | 138 | fits: 90 days to maturity, 138 available after May 27. | — |
| Dill | — | Mar 25–Jun 17 | 187 | two-plantings: Plant Mar 25 and again by Jul 21; both mature before Sep 28. | Jul 21 |
| Oregano | Mar 11 | May 27–Jun 3 | 138 | fits: 80 days to maturity, 138 available after May 27. | — |
| Rosemary | Feb 25 | May 27–Jun 3 | 124 | fits: 80 days to maturity, 124 available after May 27. | — |
| Sage | Mar 25 | May 27–Jun 3 | 138 | fits: 75 days to maturity, 138 available after May 27. | — |
| Thyme | Mar 11 | May 27–Jun 3 | 138 | fits: 90 days to maturity, 138 available after May 27. | — |
| Calendula | Apr 8 | May 6–May 20 | 145 | two-plantings: Plant May 6 and again by Jul 26; both mature before Sep 28. | Jul 26 |
| Cosmos | Apr 22 | May 20–Jun 3 | 110 | fits: 60 days to maturity, 110 available after May 20. | Jun 25 |
| Lavender | Feb 25 | May 20–Jun 3 | 145 | fits: 90 days to maturity, 145 available after May 20. | — |
| Marigolds | Apr 8 | May 20–May 27 | 110 | fits: 50 days to maturity, 110 available after May 20. | Jul 5 |
| Melons | May 6 | Jun 3–Jun 10 | 82 | head-start: Even planted out Jun 3, the outdoor season is about 3 days short; choose an early variety or grow under cover. | — |
| Mint | — | May 20–Jun 3 | 145 | fits: 90 days to maturity, 145 available after May 20. | — |
| Nasturtiums | Apr 22 | May 20–May 27 | 110 | fits: 55 days to maturity, 110 available after May 20. | Jun 30 |
| Pole Beans | — | May 27–Jun 10 | 103 | fits: 65 days to maturity, 103 available after May 27. | Jun 20 |
| Spaghetti Squash | May 6 | Jun 3–Jun 10 | 89 | head-start: Even planted out Jun 3, the outdoor season is about 1 days short; choose an early variety or grow under cover. | — |
| Sunflowers | — | May 20–Jun 3 | 110 | fits: 70 days to maturity, 110 available after May 20. | Jun 15 |
| Tomatillos | Mar 25 | May 27–Jun 3 | 89 | fits: 75 days to maturity, 89 available after May 27. | — |
| Watermelon | May 6 | May 27–Jun 3 | 89 | fits: 80 days to maturity, 89 available after May 27. | — |
| Yellow Squash | May 6 | Jun 3–Jun 10 | 96 | fits: 55 days to maturity, 96 available after Jun 3. | Jun 30 |
| Zinnias | Apr 22 | May 20–Jun 3 | 110 | fits: 60 days to maturity, 110 available after May 20. | Jun 25 |
Month by month in Concord
| Month | What to do |
|---|---|
| January | Plan your garden layout and order seeds. Research varieties suited to your frost dates. |
| February | Start indoors: Chives (Feb 25), Lavender (Feb 25), Onion (Feb 25), Rosemary (Feb 25). |
| March | Start indoors: Celery (Mar 11), Collards (Mar 11), Kale (Mar 11), Oregano (Mar 11), Parsley (Mar 11), Scallions (Mar 11), +8 more. Direct sow from: Arugula (Mar 25), Beets (Mar 25), Dill (Mar 25), Peas (Mar 25), Radish (Mar 25), Spinach (Mar 25). |
| April | Start indoors: Eggplant (Apr 1), Calendula (Apr 8), Cauliflower (Apr 8), Marigolds (Apr 8), Pepper (Apr 8), Basil (Apr 15), +8 more. Direct sow from: Kohlrabi (Apr 8), Cilantro (Apr 22), Turnip (Apr 22), Carrots (Apr 29). Transplant from: Broccoli (Apr 22), Brussel Sprouts (Apr 22), Cabbage (Apr 22), Collards (Apr 22), Kale (Apr 22), Lettuce (Apr 22), +2 more. Plant: Strawberry (Apr 15). |
| May | Start indoors: Butternut Squash (May 6), Cantaloupe (May 6), Melons (May 6), Pumpkin (May 6), Spaghetti Squash (May 6), Watermelon (May 6), +2 more. Direct sow from: Potatoes (May 6), Sunflowers (May 20), Beans (May 27), Pole Beans (May 27). Transplant from: Calendula (May 6), Swiss Chard (May 6), Bok Choy (May 13), Cauliflower (May 13), Cosmos (May 20), Lavender (May 20), +15 more. Last frost around May 20. |
| June | Transplant from: Butternut Squash (Jun 3), Cantaloupe (Jun 3), Cucumber (Jun 3), Eggplant (Jun 3), Melons (Jun 3), Pepper (Jun 3), +6 more. Last sowing dates: Corn (Jun 3), Sunflowers (Jun 15), Brussel Sprouts (Jun 20), Pole Beans (Jun 20), Basil (Jun 25), Cosmos (Jun 25), +7 more. |
| July | Last sowing dates: Cauliflower (Jul 1), Beans (Jul 2), Marigolds (Jul 5), Parsley (Jul 6), Peas (Jul 11), Cabbage (Jul 20), +10 more. |
| August | Last sowing dates: Kale (Aug 4), Kohlrabi (Aug 4), Turnip (Aug 9), Arugula (Aug 19), Spinach (Aug 19), Radish (Aug 20). |
| September | Direct sow from: Garlic (Sep 21). First frost around September 21. |
| October | Last sowing dates: Garlic (Oct 12). |
| November | Clean up spent plants. Add compost to beds. Rest, review, and plan next year's garden. |
| December | Clean up spent plants. Add compost to beds. Rest, review, and plan next year's garden. |
Frequently Asked Questions
What is the last frost date for Concord, NH (ZIP 03303)?
The median last spring frost date for Concord, NH (ZIP code 03303) is around May 20. This is the 50th-percentile date — meaning half of all years see frost end before this date. Use the 10% and 90% dates to understand the full range of risk in your area. One year in ten frost ends before May 3; one in ten it runs past June 6.
What is the first fall frost date in Concord, NH?
The median first fall frost date for Concord, NH is around September 21. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses. The first frost arrives around September 8 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Concord, NH?
The frost-free growing season in Concord is about 124 days. This window — from your last spring frost to your first fall frost — is when warm-season vegetables thrive. Cold-hardy crops like kale, spinach, and peas can extend your season by weeks on either side. In Concord (124 frost-free days, a moderate season), 35 of 56 planner crops fit outright, 15 get two plantings, 5 need an indoor start, 1 crop is perennial.
What USDA hardiness zone is Concord, NH?
Concord, NH is in USDA hardiness zone 5b (2023 USDA Plant Hardiness Zone Map). Zones come from the average coldest winter temperature, so they tell you which perennials survive the winter; the frost dates on this page tell you when to plant.
When should I start tomatoes indoors in Concord, NH?
Start tomatoes indoors Apr 15 and plant out Jun 3 in Concord. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Concord?
Two: plant Apr 22 and again by Jul 31; both mature before Sep 28.
When do I plant garlic in Concord?
Sep 21 to Oct 12; it overwinters and is ready the following summer.
Can I grow Butternut Squash in Concord?
Yes, with help. Even planted out Jun 3, the outdoor season is about 11 days short; choose an early variety or grow under cover.
Which nearby ZIP has a longer season?
Concord (ZIP 03301) has 138 frost-free days, 14 more than Concord (ZIP 03303). See Concord ZIP 03301 frost dates
Nearby and related
- Frost dates for Concord, NH 03301 (8.2 mi)
- Frost dates for Tilton, NH 03276 (10.2 mi)
- Frost dates for Belmont, NH 03220 (15.3 mi)
- Frost dates for Suncook, NH 03275 (15.9 mi)
- Frost dates for Hooksett, NH 03106 (19.6 mi)
- When to plant in NH
- When to plant Peppers in NH
- When to plant Cucumbers in NH
- When to plant Zucchini in NH
- When to plant Butternut Squash in NH
- When to plant Basil in NH
- When to plant Sweet Corn in NH
- Look up another ZIP