Frost Dates for Westport, MA 02790
Last spring frost April 20 · First fall frost November 2 · 196 frost-free days · USDA Zone 7a
ZIP 02790 has about 16,900 people.
Long season: 196 frost-free days. Spring frost risk spans April 3–May 6 (33 days). Fall frost risk spans October 11–November 21 (41 days).
Frost probability for 02790
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | May 6 | April 20 | April 3 |
| Fall (first frost) | October 11 | November 2 | November 21 |
Dates come from NOAA 1971–2000 freeze probabilities at NEWPORT ROSE (24.5 km away); the 50% date is the median year.
Which crops fit a 196-day season in Westport
In Westport (196 frost-free days, a long season), 30 of 56 planner crops fit outright, 25 get two plantings, 1 crop is perennial.
| Crop | Start indoors | Plant out / sow | Days you have | Verdict | Last sow date |
|---|---|---|---|---|---|
| Tomato | Mar 16 | May 4–May 11 | 154 | fits: 80 days to maturity, 154 available after May 4. | Jul 3 |
| Pepper | Mar 9 | May 4–May 11 | 154 | fits: 75 days to maturity, 154 available after May 4. | Jul 8 |
| Lettuce | Feb 23 | Mar 23–Mar 30 | 231 | two-plantings: Plant Mar 23 and again by Sep 11; both mature before Nov 9. | Sep 11 |
| Carrots | — | Mar 30–Apr 6 | 238 | fits: 70 days to maturity, 238 available after Mar 30. | Aug 31 |
| Cucumber | Mar 30 | May 4–May 11 | 168 | two-plantings: Plant May 4 and again by Aug 6; both mature before Oct 19. | Aug 6 |
| Beans | — | Apr 27–May 11 | 182 | two-plantings: Plant Apr 27 and again by Aug 13; both mature before Oct 26. | Aug 13 |
| Peas | — | Feb 23–May 4 | 259 | fits: 65 days to maturity, 259 available after Feb 23. | Aug 22 |
| Zucchini | Apr 6 | May 4–May 11 | 168 | two-plantings: Plant May 4 and again by Aug 11; both mature before Oct 19. | Aug 11 |
| Onion | Jan 26 | Mar 23–Apr 6 | 231 | fits: 100 days to maturity, 231 available after Mar 23. | — |
| Spinach | — | Feb 23–Apr 13 | 273 | two-plantings: Plant Feb 23 and again by Sep 30; both mature before Nov 23. | Sep 30 |
| Kale | Feb 9 | Mar 23–Apr 6 | 245 | two-plantings: Plant Mar 23 and again by Sep 15; both mature before Nov 23. | Sep 15 |
| Broccoli | Feb 23 | Mar 23–Apr 6 | 231 | fits: 80 days to maturity, 231 available after Mar 23. | Aug 7 |
| Cabbage | Feb 23 | Mar 23–Apr 6 | 245 | fits: 70 days to maturity, 245 available after Mar 23. | Aug 31 |
| Radish | — | Feb 23–May 18 | 259 | two-plantings: Plant Feb 23 and again by Oct 1; both mature before Nov 9. | Oct 1 |
| Beets | — | Feb 23–May 18 | 259 | two-plantings: Plant Feb 23 and again by Sep 1; both mature before Nov 9. | Sep 1 |
| Potatoes | — | Apr 6–Apr 13 | 217 | fits: 90 days to maturity, 217 available after Apr 6. | — |
| Garlic | — | Nov 2 | 301 | overwinter: Plant Nov 2 to Nov 23; harvest the following summer. | Nov 23 |
| Strawberry | — | Mar 16–May 11 | 252 | perennial: A perennial: plant Mar 16; it fruits from the following year and keeps producing for several years. | — |
| Corn | Mar 23 | Apr 27–May 4 | 168 | fits: 75 days to maturity, 168 available after Apr 27. | Jul 15 |
| Pumpkin | Apr 6 | May 4–May 4 | 161 | fits: 100 days to maturity, 161 available after May 4. | Jun 20 |
| Cauliflower | Mar 9 | Apr 13–Apr 27 | 210 | fits: 75 days to maturity, 210 available after Apr 13. | Aug 12 |
| Swiss Chard | Feb 23 | Apr 6–Apr 6 | 217 | two-plantings: Plant Apr 6 and again by Sep 1; both mature before Nov 9. | Sep 1 |
| Arugula | — | Feb 23–May 18 | 273 | two-plantings: Plant Feb 23 and again by Sep 30; both mature before Nov 23. | Sep 30 |
| Brussel Sprouts | Feb 23 | Mar 23–Apr 6 | 245 | fits: 100 days to maturity, 245 available after Mar 23. | Aug 1 |
| Butternut Squash | Apr 6 | May 4–May 11 | 161 | fits: 100 days to maturity, 161 available after May 4. | Jun 20 |
| Eggplant | Mar 2 | May 4–May 11 | 154 | fits: 70 days to maturity, 154 available after May 4. | Jul 13 |
| Okra | Mar 23 | Apr 27–May 4 | 175 | two-plantings: Plant Apr 27 and again by Aug 11; both mature before Oct 19. | Aug 11 |
| Basil | Mar 16 | May 11–May 11 | 161 | two-plantings: Plant May 11 and again by Aug 6; both mature before Oct 19. | Aug 6 |
| Cilantro | — | Mar 23–Apr 13 | 231 | two-plantings: Plant Mar 23 and again by Sep 6; both mature before Nov 9. | Sep 6 |
| Parsley | Feb 9 | Apr 27–May 4 | 196 | fits: 70 days to maturity, 196 available after Apr 27. | Aug 17 |
| Celery | Feb 9 | Apr 27–May 11 | 196 | fits: 120 days to maturity, 196 available after Apr 27. | Jun 28 |
| Scallions | Feb 9 | Mar 23–Apr 6 | 245 | two-plantings: Plant Mar 23 and again by Sep 10; both mature before Nov 23. | Sep 10 |
| Turnip | — | Mar 23–Apr 6 | 245 | two-plantings: Plant Mar 23 and again by Sep 20; both mature before Nov 23. | Sep 20 |
| Kohlrabi | — | Mar 9–Mar 23 | 259 | two-plantings: Plant Mar 9 and again by Sep 15; both mature before Nov 23. | Sep 15 |
| Bok Choy | Mar 23 | Apr 13–Apr 20 | 210 | two-plantings: Plant Apr 13 and again by Sep 11; both mature before Nov 9. | Sep 11 |
| Collards | Feb 9 | Mar 23–Apr 6 | 245 | two-plantings: Plant Mar 23 and again by Sep 10; both mature before Nov 23. | Sep 10 |
| Cantaloupe | Apr 6 | May 4–May 11 | 154 | fits: 85 days to maturity, 154 available after May 4. | Jun 28 |
| Chives | Jan 26 | Apr 27–May 4 | 210 | fits: 90 days to maturity, 210 available after Apr 27. | — |
| Dill | — | Feb 23–May 18 | 259 | two-plantings: Plant Feb 23 and again by Sep 1; both mature before Nov 9. | Sep 1 |
| Oregano | Feb 9 | Apr 27–May 4 | 210 | fits: 80 days to maturity, 210 available after Apr 27. | — |
| Rosemary | Jan 26 | Apr 27–May 4 | 196 | fits: 80 days to maturity, 196 available after Apr 27. | — |
| Sage | Feb 23 | Apr 27–May 4 | 210 | fits: 75 days to maturity, 210 available after Apr 27. | — |
| Thyme | Feb 9 | Apr 27–May 4 | 210 | fits: 90 days to maturity, 210 available after Apr 27. | — |
| Calendula | Mar 9 | Apr 6–Apr 20 | 217 | two-plantings: Plant Apr 6 and again by Sep 6; both mature before Nov 9. | Sep 6 |
| Cosmos | Mar 23 | Apr 20–May 4 | 182 | two-plantings: Plant Apr 20 and again by Aug 6; both mature before Oct 19. | Aug 6 |
| Lavender | Jan 26 | Apr 20–May 4 | 217 | fits: 90 days to maturity, 217 available after Apr 20. | — |
| Marigolds | Mar 9 | Apr 20–Apr 27 | 182 | two-plantings: Plant Apr 20 and again by Aug 16; both mature before Oct 19. | Aug 16 |
| Melons | Apr 6 | May 4–May 11 | 154 | fits: 85 days to maturity, 154 available after May 4. | Jun 28 |
| Mint | — | Apr 20–May 4 | 217 | fits: 90 days to maturity, 217 available after Apr 20. | — |
| Nasturtiums | Mar 23 | Apr 20–Apr 27 | 182 | two-plantings: Plant Apr 20 and again by Aug 11; both mature before Oct 19. | Aug 11 |
| Pole Beans | — | Apr 27–May 11 | 175 | fits: 65 days to maturity, 175 available after Apr 27. | Aug 1 |
| Spaghetti Squash | Apr 6 | May 4–May 11 | 161 | fits: 90 days to maturity, 161 available after May 4. | Jun 30 |
| Sunflowers | — | Apr 20–May 4 | 182 | fits: 70 days to maturity, 182 available after Apr 20. | Jul 27 |
| Tomatillos | Feb 23 | Apr 27–May 4 | 161 | fits: 75 days to maturity, 161 available after Apr 27. | Jul 8 |
| Watermelon | Apr 6 | Apr 27–May 4 | 161 | fits: 80 days to maturity, 161 available after Apr 27. | Jul 3 |
| Yellow Squash | Apr 6 | May 4–May 11 | 168 | two-plantings: Plant May 4 and again by Aug 11; both mature before Oct 19. | Aug 11 |
| Zinnias | Mar 23 | Apr 20–May 4 | 182 | two-plantings: Plant Apr 20 and again by Aug 6; both mature before Oct 19. | Aug 6 |
Month by month in Westport
| Month | What to do |
|---|---|
| January | Start indoors: Chives (Jan 26), Lavender (Jan 26), Onion (Jan 26), Rosemary (Jan 26). |
| February | Start indoors: Celery (Feb 9), Collards (Feb 9), Kale (Feb 9), Oregano (Feb 9), Parsley (Feb 9), Scallions (Feb 9), +8 more. Direct sow from: Arugula (Feb 23), Beets (Feb 23), Dill (Feb 23), Peas (Feb 23), Radish (Feb 23), Spinach (Feb 23). |
| March | Start indoors: Eggplant (Mar 2), Calendula (Mar 9), Cauliflower (Mar 9), Marigolds (Mar 9), Pepper (Mar 9), Basil (Mar 16), +8 more. Direct sow from: Kohlrabi (Mar 9), Cilantro (Mar 23), Turnip (Mar 23), Carrots (Mar 30). Transplant from: Broccoli (Mar 23), Brussel Sprouts (Mar 23), Cabbage (Mar 23), Collards (Mar 23), Kale (Mar 23), Lettuce (Mar 23), +2 more. Plant: Strawberry (Mar 16). |
| April | Start indoors: Butternut Squash (Apr 6), Cantaloupe (Apr 6), Melons (Apr 6), Pumpkin (Apr 6), Spaghetti Squash (Apr 6), Watermelon (Apr 6), +2 more. Direct sow from: Potatoes (Apr 6), Sunflowers (Apr 20), Beans (Apr 27), Pole Beans (Apr 27). Transplant from: Calendula (Apr 6), Swiss Chard (Apr 6), Bok Choy (Apr 13), Cauliflower (Apr 13), Cosmos (Apr 20), Lavender (Apr 20), +15 more. Last frost around April 20. |
| May | Transplant from: Butternut Squash (May 4), Cantaloupe (May 4), Cucumber (May 4), Eggplant (May 4), Melons (May 4), Pepper (May 4), +6 more. |
| June | Last sowing dates: Butternut Squash (Jun 20), Pumpkin (Jun 20), Cantaloupe (Jun 28), Celery (Jun 28), Melons (Jun 28), Spaghetti Squash (Jun 30). |
| July | Last sowing dates: Tomato (Jul 3), Watermelon (Jul 3), Pepper (Jul 8), Tomatillos (Jul 8), Eggplant (Jul 13), Corn (Jul 15), +1 more. |
| August | Last sowing dates: Brussel Sprouts (Aug 1), Pole Beans (Aug 1), Basil (Aug 6), Cosmos (Aug 6), Cucumber (Aug 6), Zinnias (Aug 6), +12 more. |
| September | Last sowing dates: Beets (Sep 1), Dill (Sep 1), Swiss Chard (Sep 1), Calendula (Sep 6), Cilantro (Sep 6), Collards (Sep 10), +8 more. |
| October | Last sowing dates: Radish (Oct 1). |
| November | Direct sow from: Garlic (Nov 2). First frost around November 2. Last sowing dates: Garlic (Nov 23). |
| December | Harvest remaining cold-hardy crops: kale, carrots, and beets. Plant garlic bulbs for next year. |
Frequently Asked Questions
What is the last frost date for Westport, MA (ZIP 02790)?
The median last spring frost date for Westport, MA (ZIP code 02790) is around April 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 April 3; one in ten it runs past May 6.
What is the first fall frost date in Westport, MA?
The median first fall frost date for Westport, MA is around November 2. 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 October 11 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Westport, MA?
The frost-free growing season in Westport is about 196 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 Westport (196 frost-free days, a long season), 30 of 56 planner crops fit outright, 25 get two plantings, 1 crop is perennial.
What USDA hardiness zone is Westport, MA?
Westport, MA is in USDA hardiness zone 7a (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 Westport, MA?
Start tomatoes indoors Mar 16 and plant out May 4 in Westport. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Westport?
Two: plant Mar 23 and again by Sep 11; both mature before Nov 9.
When do I plant garlic in Westport?
Nov 2 to Nov 23; it overwinters and is ready the following summer.
Can I get two tomato crops in Westport?
Yes: plant out May 4 for a summer crop, and set out a second round of transplants by Jul 3 for a fall crop.
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