Frost Dates for Boonsboro, MD 21713
Last spring frost April 19 · First fall frost October 24 · 188 frost-free days · USDA Zone 7a
ZIP 21713 has about 9,850 people.
Long season: 188 frost-free days. Spring frost risk spans April 5–May 4 (29 days). Fall frost risk spans October 11–November 6 (26 days).
Frost probability for 21713
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | May 4 | April 19 | April 5 |
| Fall (first frost) | October 11 | October 24 | November 6 |
Dates come from NOAA 1971–2000 freeze probabilities at MARTINSBURG E W VIRGINIA RGNL (29.6 km away); the 50% date is the median year.
Which crops fit a 188-day season in Boonsboro
In Boonsboro (188 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 15 | May 3–May 10 | 146 | fits: 80 days to maturity, 146 available after May 3. | Jun 24 |
| Pepper | Mar 8 | May 3–May 10 | 146 | fits: 75 days to maturity, 146 available after May 3. | Jun 29 |
| Lettuce | Feb 22 | Mar 22–Mar 29 | 223 | two-plantings: Plant Mar 22 and again by Sep 2; both mature before Oct 31. | Sep 2 |
| Carrots | — | Mar 29–Apr 5 | 230 | fits: 70 days to maturity, 230 available after Mar 29. | Aug 22 |
| Cucumber | Mar 29 | May 3–May 10 | 160 | two-plantings: Plant May 3 and again by Jul 28; both mature before Oct 10. | Jul 28 |
| Beans | — | Apr 26–May 10 | 174 | two-plantings: Plant Apr 26 and again by Aug 4; both mature before Oct 17. | Aug 4 |
| Peas | — | Feb 22–May 3 | 251 | fits: 65 days to maturity, 251 available after Feb 22. | Aug 13 |
| Zucchini | Apr 5 | May 3–May 10 | 160 | two-plantings: Plant May 3 and again by Aug 2; both mature before Oct 10. | Aug 2 |
| Onion | Jan 25 | Mar 22–Apr 5 | 223 | fits: 100 days to maturity, 223 available after Mar 22. | — |
| Spinach | — | Feb 22–Apr 12 | 265 | two-plantings: Plant Feb 22 and again by Sep 21; both mature before Nov 14. | Sep 21 |
| Kale | Feb 8 | Mar 22–Apr 5 | 237 | two-plantings: Plant Mar 22 and again by Sep 6; both mature before Nov 14. | Sep 6 |
| Broccoli | Feb 22 | Mar 22–Apr 5 | 223 | fits: 80 days to maturity, 223 available after Mar 22. | Jul 29 |
| Cabbage | Feb 22 | Mar 22–Apr 5 | 237 | fits: 70 days to maturity, 237 available after Mar 22. | Aug 22 |
| Radish | — | Feb 22–May 17 | 251 | two-plantings: Plant Feb 22 and again by Sep 22; both mature before Oct 31. | Sep 22 |
| Beets | — | Feb 22–May 17 | 251 | two-plantings: Plant Feb 22 and again by Aug 23; both mature before Oct 31. | Aug 23 |
| Potatoes | — | Apr 5–Apr 12 | 209 | fits: 90 days to maturity, 209 available after Apr 5. | — |
| Garlic | — | Oct 24 | 293 | overwinter: Plant Oct 24 to Nov 14; harvest the following summer. | Nov 14 |
| Strawberry | — | Mar 15–May 10 | 244 | perennial: A perennial: plant Mar 15; it fruits from the following year and keeps producing for several years. | — |
| Corn | Mar 22 | Apr 26–May 3 | 160 | fits: 75 days to maturity, 160 available after Apr 26. | Jul 6 |
| Pumpkin | Apr 5 | May 3–May 3 | 153 | fits: 100 days to maturity, 153 available after May 3. | Jun 11 |
| Cauliflower | Mar 8 | Apr 12–Apr 26 | 202 | fits: 75 days to maturity, 202 available after Apr 12. | Aug 3 |
| Swiss Chard | Feb 22 | Apr 5–Apr 5 | 209 | two-plantings: Plant Apr 5 and again by Aug 23; both mature before Oct 31. | Aug 23 |
| Arugula | — | Feb 22–May 17 | 265 | two-plantings: Plant Feb 22 and again by Sep 21; both mature before Nov 14. | Sep 21 |
| Brussel Sprouts | Feb 22 | Mar 22–Apr 5 | 237 | fits: 100 days to maturity, 237 available after Mar 22. | Jul 23 |
| Butternut Squash | Apr 5 | May 3–May 10 | 153 | fits: 100 days to maturity, 153 available after May 3. | Jun 11 |
| Eggplant | Mar 1 | May 3–May 10 | 146 | fits: 70 days to maturity, 146 available after May 3. | Jul 4 |
| Okra | Mar 22 | Apr 26–May 3 | 167 | two-plantings: Plant Apr 26 and again by Aug 2; both mature before Oct 10. | Aug 2 |
| Basil | Mar 15 | May 10–May 10 | 153 | two-plantings: Plant May 10 and again by Jul 28; both mature before Oct 10. | Jul 28 |
| Cilantro | — | Mar 22–Apr 12 | 223 | two-plantings: Plant Mar 22 and again by Aug 28; both mature before Oct 31. | Aug 28 |
| Parsley | Feb 8 | Apr 26–May 3 | 188 | fits: 70 days to maturity, 188 available after Apr 26. | Aug 8 |
| Celery | Feb 8 | Apr 26–May 10 | 188 | fits: 120 days to maturity, 188 available after Apr 26. | Jun 19 |
| Scallions | Feb 8 | Mar 22–Apr 5 | 237 | two-plantings: Plant Mar 22 and again by Sep 1; both mature before Nov 14. | Sep 1 |
| Turnip | — | Mar 22–Apr 5 | 237 | two-plantings: Plant Mar 22 and again by Sep 11; both mature before Nov 14. | Sep 11 |
| Kohlrabi | — | Mar 8–Mar 22 | 251 | two-plantings: Plant Mar 8 and again by Sep 6; both mature before Nov 14. | Sep 6 |
| Bok Choy | Mar 22 | Apr 12–Apr 19 | 202 | two-plantings: Plant Apr 12 and again by Sep 2; both mature before Oct 31. | Sep 2 |
| Collards | Feb 8 | Mar 22–Apr 5 | 237 | two-plantings: Plant Mar 22 and again by Sep 1; both mature before Nov 14. | Sep 1 |
| Cantaloupe | Apr 5 | May 3–May 10 | 146 | fits: 85 days to maturity, 146 available after May 3. | Jun 19 |
| Chives | Jan 25 | Apr 26–May 3 | 202 | fits: 90 days to maturity, 202 available after Apr 26. | — |
| Dill | — | Feb 22–May 17 | 251 | two-plantings: Plant Feb 22 and again by Aug 23; both mature before Oct 31. | Aug 23 |
| Oregano | Feb 8 | Apr 26–May 3 | 202 | fits: 80 days to maturity, 202 available after Apr 26. | — |
| Rosemary | Jan 25 | Apr 26–May 3 | 188 | fits: 80 days to maturity, 188 available after Apr 26. | — |
| Sage | Feb 22 | Apr 26–May 3 | 202 | fits: 75 days to maturity, 202 available after Apr 26. | — |
| Thyme | Feb 8 | Apr 26–May 3 | 202 | fits: 90 days to maturity, 202 available after Apr 26. | — |
| Calendula | Mar 8 | Apr 5–Apr 19 | 209 | two-plantings: Plant Apr 5 and again by Aug 28; both mature before Oct 31. | Aug 28 |
| Cosmos | Mar 22 | Apr 19–May 3 | 174 | two-plantings: Plant Apr 19 and again by Jul 28; both mature before Oct 10. | Jul 28 |
| Lavender | Jan 25 | Apr 19–May 3 | 209 | fits: 90 days to maturity, 209 available after Apr 19. | — |
| Marigolds | Mar 8 | Apr 19–Apr 26 | 174 | two-plantings: Plant Apr 19 and again by Aug 7; both mature before Oct 10. | Aug 7 |
| Melons | Apr 5 | May 3–May 10 | 146 | fits: 85 days to maturity, 146 available after May 3. | Jun 19 |
| Mint | — | Apr 19–May 3 | 209 | fits: 90 days to maturity, 209 available after Apr 19. | — |
| Nasturtiums | Mar 22 | Apr 19–Apr 26 | 174 | two-plantings: Plant Apr 19 and again by Aug 2; both mature before Oct 10. | Aug 2 |
| Pole Beans | — | Apr 26–May 10 | 167 | fits: 65 days to maturity, 167 available after Apr 26. | Jul 23 |
| Spaghetti Squash | Apr 5 | May 3–May 10 | 153 | fits: 90 days to maturity, 153 available after May 3. | Jun 21 |
| Sunflowers | — | Apr 19–May 3 | 174 | fits: 70 days to maturity, 174 available after Apr 19. | Jul 18 |
| Tomatillos | Feb 22 | Apr 26–May 3 | 153 | fits: 75 days to maturity, 153 available after Apr 26. | Jun 29 |
| Watermelon | Apr 5 | Apr 26–May 3 | 153 | fits: 80 days to maturity, 153 available after Apr 26. | Jun 24 |
| Yellow Squash | Apr 5 | May 3–May 10 | 160 | two-plantings: Plant May 3 and again by Aug 2; both mature before Oct 10. | Aug 2 |
| Zinnias | Mar 22 | Apr 19–May 3 | 174 | two-plantings: Plant Apr 19 and again by Jul 28; both mature before Oct 10. | Jul 28 |
Month by month in Boonsboro
| Month | What to do |
|---|---|
| January | Start indoors: Chives (Jan 25), Lavender (Jan 25), Onion (Jan 25), Rosemary (Jan 25). |
| February | Start indoors: Celery (Feb 8), Collards (Feb 8), Kale (Feb 8), Oregano (Feb 8), Parsley (Feb 8), Scallions (Feb 8), +8 more. Direct sow from: Arugula (Feb 22), Beets (Feb 22), Dill (Feb 22), Peas (Feb 22), Radish (Feb 22), Spinach (Feb 22). |
| March | Start indoors: Eggplant (Mar 1), Calendula (Mar 8), Cauliflower (Mar 8), Marigolds (Mar 8), Pepper (Mar 8), Basil (Mar 15), +8 more. Direct sow from: Kohlrabi (Mar 8), Cilantro (Mar 22), Turnip (Mar 22), Carrots (Mar 29). Transplant from: Broccoli (Mar 22), Brussel Sprouts (Mar 22), Cabbage (Mar 22), Collards (Mar 22), Kale (Mar 22), Lettuce (Mar 22), +2 more. Plant: Strawberry (Mar 15). |
| April | Start indoors: Butternut Squash (Apr 5), Cantaloupe (Apr 5), Melons (Apr 5), Pumpkin (Apr 5), Spaghetti Squash (Apr 5), Watermelon (Apr 5), +2 more. Direct sow from: Potatoes (Apr 5), Sunflowers (Apr 19), Beans (Apr 26), Pole Beans (Apr 26). Transplant from: Calendula (Apr 5), Swiss Chard (Apr 5), Bok Choy (Apr 12), Cauliflower (Apr 12), Cosmos (Apr 19), Lavender (Apr 19), +15 more. Last frost around April 19. |
| May | Transplant from: Butternut Squash (May 3), Cantaloupe (May 3), Cucumber (May 3), Eggplant (May 3), Melons (May 3), Pepper (May 3), +6 more. |
| June | Last sowing dates: Butternut Squash (Jun 11), Pumpkin (Jun 11), Cantaloupe (Jun 19), Celery (Jun 19), Melons (Jun 19), Spaghetti Squash (Jun 21), +4 more. |
| July | Last sowing dates: Eggplant (Jul 4), Corn (Jul 6), Sunflowers (Jul 18), Brussel Sprouts (Jul 23), Pole Beans (Jul 23), Basil (Jul 28), +4 more. |
| August | Last sowing dates: Nasturtiums (Aug 2), Okra (Aug 2), Yellow Squash (Aug 2), Zucchini (Aug 2), Cauliflower (Aug 3), Beans (Aug 4), +10 more. |
| September | Last sowing dates: Collards (Sep 1), Scallions (Sep 1), Bok Choy (Sep 2), Lettuce (Sep 2), Kale (Sep 6), Kohlrabi (Sep 6), +4 more. |
| October | Direct sow from: Garlic (Oct 24). First frost around October 24. |
| November | Last sowing dates: Garlic (Nov 14). |
| 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 Boonsboro, MD (ZIP 21713)?
The median last spring frost date for Boonsboro, MD (ZIP code 21713) is around April 19. 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 5; one in ten it runs past May 4.
What is the first fall frost date in Boonsboro, MD?
The median first fall frost date for Boonsboro, MD is around October 24. 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 Boonsboro, MD?
The frost-free growing season in Boonsboro is about 188 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 Boonsboro (188 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 Boonsboro, MD?
Boonsboro, MD 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 Boonsboro, MD?
Start tomatoes indoors Mar 15 and plant out May 3 in Boonsboro. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Boonsboro?
Two: plant Mar 22 and again by Sep 2; both mature before Oct 31.
When do I plant garlic in Boonsboro?
Oct 24 to Nov 14; it overwinters and is ready the following summer.
Can I get two tomato crops in Boonsboro?
Yes: plant out May 3 for a summer crop, and set out a second round of transplants by Jun 24 for a fall crop.
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