Frost Dates for Smithville, TN 37166
Last spring frost April 17 · First fall frost October 17 · 183 frost-free days · USDA Zone 7b
ZIP 37166 has about 15,700 people.
Long season: 183 frost-free days. Spring frost risk spans April 4–April 30 (26 days). Fall frost risk spans October 1–November 2 (32 days).
Frost probability for 37166
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | April 30 | April 17 | April 4 |
| Fall (first frost) | October 1 | October 17 | November 2 |
Dates come from NOAA 1971–2000 freeze probabilities at SMITHVILLE 2 SE (1.9 km away); the 50% date is the median year.
Which crops fit a 183-day season in Smithville
In Smithville (183 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 13 | May 1–May 8 | 141 | fits: 80 days to maturity, 141 available after May 1. | Jun 17 |
| Pepper | Mar 6 | May 1–May 8 | 141 | fits: 75 days to maturity, 141 available after May 1. | Jun 22 |
| Lettuce | Feb 20 | Mar 20–Mar 27 | 218 | two-plantings: Plant Mar 20 and again by Aug 26; both mature before Oct 24. | Aug 26 |
| Carrots | — | Mar 27–Apr 3 | 225 | fits: 70 days to maturity, 225 available after Mar 27. | Aug 15 |
| Cucumber | Mar 27 | May 1–May 8 | 155 | two-plantings: Plant May 1 and again by Jul 21; both mature before Oct 3. | Jul 21 |
| Beans | — | Apr 24–May 8 | 169 | two-plantings: Plant Apr 24 and again by Jul 28; both mature before Oct 10. | Jul 28 |
| Peas | — | Feb 20–May 1 | 246 | fits: 65 days to maturity, 246 available after Feb 20. | Aug 6 |
| Zucchini | Apr 3 | May 1–May 8 | 155 | two-plantings: Plant May 1 and again by Jul 26; both mature before Oct 3. | Jul 26 |
| Onion | Jan 23 | Mar 20–Apr 3 | 218 | fits: 100 days to maturity, 218 available after Mar 20. | — |
| Spinach | — | Feb 20–Apr 10 | 260 | two-plantings: Plant Feb 20 and again by Sep 14; both mature before Nov 7. | Sep 14 |
| Kale | Feb 6 | Mar 20–Apr 3 | 232 | two-plantings: Plant Mar 20 and again by Aug 30; both mature before Nov 7. | Aug 30 |
| Broccoli | Feb 20 | Mar 20–Apr 3 | 218 | fits: 80 days to maturity, 218 available after Mar 20. | Jul 22 |
| Cabbage | Feb 20 | Mar 20–Apr 3 | 232 | fits: 70 days to maturity, 232 available after Mar 20. | Aug 15 |
| Radish | — | Feb 20–May 15 | 246 | two-plantings: Plant Feb 20 and again by Sep 15; both mature before Oct 24. | Sep 15 |
| Beets | — | Feb 20–May 15 | 246 | two-plantings: Plant Feb 20 and again by Aug 16; both mature before Oct 24. | Aug 16 |
| Potatoes | — | Apr 3–Apr 10 | 204 | fits: 90 days to maturity, 204 available after Apr 3. | — |
| Garlic | — | Oct 17 | 288 | overwinter: Plant Oct 17 to Nov 7; harvest the following summer. | Nov 7 |
| Strawberry | — | Mar 13–May 8 | 239 | perennial: A perennial: plant Mar 13; it fruits from the following year and keeps producing for several years. | — |
| Corn | Mar 20 | Apr 24–May 1 | 155 | fits: 75 days to maturity, 155 available after Apr 24. | Jun 29 |
| Pumpkin | Apr 3 | May 1–May 1 | 148 | fits: 100 days to maturity, 148 available after May 1. | Jun 4 |
| Cauliflower | Mar 6 | Apr 10–Apr 24 | 197 | fits: 75 days to maturity, 197 available after Apr 10. | Jul 27 |
| Swiss Chard | Feb 20 | Apr 3–Apr 3 | 204 | two-plantings: Plant Apr 3 and again by Aug 16; both mature before Oct 24. | Aug 16 |
| Arugula | — | Feb 20–May 15 | 260 | two-plantings: Plant Feb 20 and again by Sep 14; both mature before Nov 7. | Sep 14 |
| Brussel Sprouts | Feb 20 | Mar 20–Apr 3 | 232 | fits: 100 days to maturity, 232 available after Mar 20. | Jul 16 |
| Butternut Squash | Apr 3 | May 1–May 8 | 148 | fits: 100 days to maturity, 148 available after May 1. | Jun 4 |
| Eggplant | Feb 27 | May 1–May 8 | 141 | fits: 70 days to maturity, 141 available after May 1. | Jun 27 |
| Okra | Mar 20 | Apr 24–May 1 | 162 | two-plantings: Plant Apr 24 and again by Jul 26; both mature before Oct 3. | Jul 26 |
| Basil | Mar 13 | May 8–May 8 | 148 | two-plantings: Plant May 8 and again by Jul 21; both mature before Oct 3. | Jul 21 |
| Cilantro | — | Mar 20–Apr 10 | 218 | two-plantings: Plant Mar 20 and again by Aug 21; both mature before Oct 24. | Aug 21 |
| Parsley | Feb 6 | Apr 24–May 1 | 183 | fits: 70 days to maturity, 183 available after Apr 24. | Aug 1 |
| Celery | Feb 6 | Apr 24–May 8 | 183 | fits: 120 days to maturity, 183 available after Apr 24. | Jun 12 |
| Scallions | Feb 6 | Mar 20–Apr 3 | 232 | two-plantings: Plant Mar 20 and again by Aug 25; both mature before Nov 7. | Aug 25 |
| Turnip | — | Mar 20–Apr 3 | 232 | two-plantings: Plant Mar 20 and again by Sep 4; both mature before Nov 7. | Sep 4 |
| Kohlrabi | — | Mar 6–Mar 20 | 246 | two-plantings: Plant Mar 6 and again by Aug 30; both mature before Nov 7. | Aug 30 |
| Bok Choy | Mar 20 | Apr 10–Apr 17 | 197 | two-plantings: Plant Apr 10 and again by Aug 26; both mature before Oct 24. | Aug 26 |
| Collards | Feb 6 | Mar 20–Apr 3 | 232 | two-plantings: Plant Mar 20 and again by Aug 25; both mature before Nov 7. | Aug 25 |
| Cantaloupe | Apr 3 | May 1–May 8 | 141 | fits: 85 days to maturity, 141 available after May 1. | Jun 12 |
| Chives | Jan 23 | Apr 24–May 1 | 197 | fits: 90 days to maturity, 197 available after Apr 24. | — |
| Dill | — | Feb 20–May 15 | 246 | two-plantings: Plant Feb 20 and again by Aug 16; both mature before Oct 24. | Aug 16 |
| Oregano | Feb 6 | Apr 24–May 1 | 197 | fits: 80 days to maturity, 197 available after Apr 24. | — |
| Rosemary | Jan 23 | Apr 24–May 1 | 183 | fits: 80 days to maturity, 183 available after Apr 24. | — |
| Sage | Feb 20 | Apr 24–May 1 | 197 | fits: 75 days to maturity, 197 available after Apr 24. | — |
| Thyme | Feb 6 | Apr 24–May 1 | 197 | fits: 90 days to maturity, 197 available after Apr 24. | — |
| Calendula | Mar 6 | Apr 3–Apr 17 | 204 | two-plantings: Plant Apr 3 and again by Aug 21; both mature before Oct 24. | Aug 21 |
| Cosmos | Mar 20 | Apr 17–May 1 | 169 | two-plantings: Plant Apr 17 and again by Jul 21; both mature before Oct 3. | Jul 21 |
| Lavender | Jan 23 | Apr 17–May 1 | 204 | fits: 90 days to maturity, 204 available after Apr 17. | — |
| Marigolds | Mar 6 | Apr 17–Apr 24 | 169 | two-plantings: Plant Apr 17 and again by Jul 31; both mature before Oct 3. | Jul 31 |
| Melons | Apr 3 | May 1–May 8 | 141 | fits: 85 days to maturity, 141 available after May 1. | Jun 12 |
| Mint | — | Apr 17–May 1 | 204 | fits: 90 days to maturity, 204 available after Apr 17. | — |
| Nasturtiums | Mar 20 | Apr 17–Apr 24 | 169 | two-plantings: Plant Apr 17 and again by Jul 26; both mature before Oct 3. | Jul 26 |
| Pole Beans | — | Apr 24–May 8 | 162 | fits: 65 days to maturity, 162 available after Apr 24. | Jul 16 |
| Spaghetti Squash | Apr 3 | May 1–May 8 | 148 | fits: 90 days to maturity, 148 available after May 1. | Jun 14 |
| Sunflowers | — | Apr 17–May 1 | 169 | fits: 70 days to maturity, 169 available after Apr 17. | Jul 11 |
| Tomatillos | Feb 20 | Apr 24–May 1 | 148 | fits: 75 days to maturity, 148 available after Apr 24. | Jun 22 |
| Watermelon | Apr 3 | Apr 24–May 1 | 148 | fits: 80 days to maturity, 148 available after Apr 24. | Jun 17 |
| Yellow Squash | Apr 3 | May 1–May 8 | 155 | two-plantings: Plant May 1 and again by Jul 26; both mature before Oct 3. | Jul 26 |
| Zinnias | Mar 20 | Apr 17–May 1 | 169 | two-plantings: Plant Apr 17 and again by Jul 21; both mature before Oct 3. | Jul 21 |
Month by month in Smithville
| Month | What to do |
|---|---|
| January | Start indoors: Chives (Jan 23), Lavender (Jan 23), Onion (Jan 23), Rosemary (Jan 23). |
| February | Start indoors: Celery (Feb 6), Collards (Feb 6), Kale (Feb 6), Oregano (Feb 6), Parsley (Feb 6), Scallions (Feb 6), +9 more. Direct sow from: Arugula (Feb 20), Beets (Feb 20), Dill (Feb 20), Peas (Feb 20), Radish (Feb 20), Spinach (Feb 20). |
| March | Start indoors: Calendula (Mar 6), Cauliflower (Mar 6), Marigolds (Mar 6), Pepper (Mar 6), Basil (Mar 13), Tomato (Mar 13), +7 more. Direct sow from: Kohlrabi (Mar 6), Cilantro (Mar 20), Turnip (Mar 20), Carrots (Mar 27). Transplant from: Broccoli (Mar 20), Brussel Sprouts (Mar 20), Cabbage (Mar 20), Collards (Mar 20), Kale (Mar 20), Lettuce (Mar 20), +2 more. Plant: Strawberry (Mar 13). |
| April | Start indoors: Butternut Squash (Apr 3), Cantaloupe (Apr 3), Melons (Apr 3), Pumpkin (Apr 3), Spaghetti Squash (Apr 3), Watermelon (Apr 3), +2 more. Direct sow from: Potatoes (Apr 3), Sunflowers (Apr 17), Beans (Apr 24), Pole Beans (Apr 24). Transplant from: Calendula (Apr 3), Swiss Chard (Apr 3), Bok Choy (Apr 10), Cauliflower (Apr 10), Cosmos (Apr 17), Lavender (Apr 17), +15 more. Last frost around April 17. |
| May | Transplant from: Butternut Squash (May 1), Cantaloupe (May 1), Cucumber (May 1), Eggplant (May 1), Melons (May 1), Pepper (May 1), +6 more. |
| June | Last sowing dates: Butternut Squash (Jun 4), Pumpkin (Jun 4), Cantaloupe (Jun 12), Celery (Jun 12), Melons (Jun 12), Spaghetti Squash (Jun 14), +6 more. |
| July | Last sowing dates: Sunflowers (Jul 11), Brussel Sprouts (Jul 16), Pole Beans (Jul 16), Basil (Jul 21), Cosmos (Jul 21), Cucumber (Jul 21), +9 more. |
| August | Last sowing dates: Parsley (Aug 1), Peas (Aug 6), Cabbage (Aug 15), Carrots (Aug 15), Beets (Aug 16), Dill (Aug 16), +9 more. |
| September | Last sowing dates: Turnip (Sep 4), Arugula (Sep 14), Spinach (Sep 14), Radish (Sep 15). |
| October | Direct sow from: Garlic (Oct 17). First frost around October 17. |
| November | Last sowing dates: Garlic (Nov 7). |
| 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 Smithville, TN (ZIP 37166)?
The median last spring frost date for Smithville, TN (ZIP code 37166) is around April 17. 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 4; one in ten it runs past April 30.
What is the first fall frost date in Smithville, TN?
The median first fall frost date for Smithville, TN is around October 17. 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 1 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Smithville, TN?
The frost-free growing season in Smithville is about 183 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 Smithville (183 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 Smithville, TN?
Smithville, TN is in USDA hardiness zone 7b (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 Smithville, TN?
Start tomatoes indoors Mar 13 and plant out May 1 in Smithville. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Smithville?
Two: plant Mar 20 and again by Aug 26; both mature before Oct 24.
When do I plant garlic in Smithville?
Oct 17 to Nov 7; it overwinters and is ready the following summer.
Can I get two tomato crops in Smithville?
Yes: plant out May 1 for a summer crop, and set out a second round of transplants by Jun 17 for a fall crop.
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