Frost Dates for Denison, TX 75021
Denison has 2 ZIP codes. The Denison, TX frost page lists all of them with their dates.
Last spring frost March 27 · First fall frost November 8 · 226 frost-free days · USDA Zone 8a
ZIP 75021 has about 9,170 people, one of 2 ZIP codes in Denison.
Long season: 226 frost-free days. Spring frost risk spans March 11–April 12 (32 days). Fall frost risk spans October 22–November 25 (34 days).
Frost probability for 75021
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | April 12 | March 27 | March 11 |
| Fall (first frost) | October 22 | November 8 | November 25 |
Dates come from NOAA 1971–2000 freeze probabilities at BONHAM 3NNE (30.2 km away); the 50% date is the median year.
Which crops fit a 226-day season in Denison
In Denison (226 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 | Feb 20 | Apr 10–Apr 17 | 184 | fits: 80 days to maturity, 184 available after Apr 10. | Jul 9 |
| Pepper | Feb 13 | Apr 10–Apr 17 | 184 | fits: 75 days to maturity, 184 available after Apr 10. | Jul 14 |
| Lettuce | Jan 30 | Feb 27–Mar 6 | 261 | two-plantings: Plant Feb 27 and again by Sep 17; both mature before Nov 15. | Sep 17 |
| Carrots | — | Mar 6–Mar 13 | 268 | fits: 70 days to maturity, 268 available after Mar 6. | Sep 6 |
| Cucumber | Mar 6 | Apr 10–Apr 17 | 198 | two-plantings: Plant Apr 10 and again by Aug 12; both mature before Oct 25. | Aug 12 |
| Beans | — | Apr 3–Apr 17 | 212 | two-plantings: Plant Apr 3 and again by Aug 19; both mature before Nov 1. | Aug 19 |
| Peas | — | Jan 30–Apr 10 | 289 | fits: 65 days to maturity, 289 available after Jan 30. | Aug 28 |
| Zucchini | Mar 13 | Apr 10–Apr 17 | 198 | two-plantings: Plant Apr 10 and again by Aug 17; both mature before Oct 25. | Aug 17 |
| Onion | Jan 2 | Feb 27–Mar 13 | 261 | fits: 100 days to maturity, 261 available after Feb 27. | — |
| Spinach | — | Jan 30–Mar 20 | 303 | two-plantings: Plant Jan 30 and again by Oct 6; both mature before Nov 29. | Oct 6 |
| Kale | Jan 16 | Feb 27–Mar 13 | 275 | two-plantings: Plant Feb 27 and again by Sep 21; both mature before Nov 29. | Sep 21 |
| Broccoli | Jan 30 | Feb 27–Mar 13 | 261 | fits: 80 days to maturity, 261 available after Feb 27. | Aug 13 |
| Cabbage | Jan 30 | Feb 27–Mar 13 | 275 | fits: 70 days to maturity, 275 available after Feb 27. | Sep 6 |
| Radish | — | Jan 30–Apr 24 | 289 | two-plantings: Plant Jan 30 and again by Oct 7; both mature before Nov 15. | Oct 7 |
| Beets | — | Jan 30–Apr 24 | 289 | two-plantings: Plant Jan 30 and again by Sep 7; both mature before Nov 15. | Sep 7 |
| Potatoes | — | Mar 13–Mar 20 | 247 | fits: 90 days to maturity, 247 available after Mar 13. | — |
| Garlic | — | Nov 8 | 331 | overwinter: Plant Nov 8 to Nov 29; harvest the following summer. | Nov 29 |
| Strawberry | — | Feb 20–Apr 17 | 282 | perennial: A perennial: plant Feb 20; it fruits from the following year and keeps producing for several years. | — |
| Corn | Feb 27 | Apr 3–Apr 10 | 198 | fits: 75 days to maturity, 198 available after Apr 3. | Jul 21 |
| Pumpkin | Mar 13 | Apr 10–Apr 10 | 191 | fits: 100 days to maturity, 191 available after Apr 10. | Jun 26 |
| Cauliflower | Feb 13 | Mar 20–Apr 3 | 240 | fits: 75 days to maturity, 240 available after Mar 20. | Aug 18 |
| Swiss Chard | Jan 30 | Mar 13–Mar 13 | 247 | two-plantings: Plant Mar 13 and again by Sep 7; both mature before Nov 15. | Sep 7 |
| Arugula | — | Jan 30–Apr 24 | 303 | two-plantings: Plant Jan 30 and again by Oct 6; both mature before Nov 29. | Oct 6 |
| Brussel Sprouts | Jan 30 | Feb 27–Mar 13 | 275 | fits: 100 days to maturity, 275 available after Feb 27. | Aug 7 |
| Butternut Squash | Mar 13 | Apr 10–Apr 17 | 191 | fits: 100 days to maturity, 191 available after Apr 10. | Jun 26 |
| Eggplant | Feb 6 | Apr 10–Apr 17 | 184 | fits: 70 days to maturity, 184 available after Apr 10. | Jul 19 |
| Okra | Feb 27 | Apr 3–Apr 10 | 205 | two-plantings: Plant Apr 3 and again by Aug 17; both mature before Oct 25. | Aug 17 |
| Basil | Feb 20 | Apr 17–Apr 17 | 191 | two-plantings: Plant Apr 17 and again by Aug 12; both mature before Oct 25. | Aug 12 |
| Cilantro | — | Feb 27–Mar 20 | 261 | two-plantings: Plant Feb 27 and again by Sep 12; both mature before Nov 15. | Sep 12 |
| Parsley | Jan 16 | Apr 3–Apr 10 | 226 | fits: 70 days to maturity, 226 available after Apr 3. | Aug 23 |
| Celery | Jan 16 | Apr 3–Apr 17 | 226 | fits: 120 days to maturity, 226 available after Apr 3. | Jul 4 |
| Scallions | Jan 16 | Feb 27–Mar 13 | 275 | two-plantings: Plant Feb 27 and again by Sep 16; both mature before Nov 29. | Sep 16 |
| Turnip | — | Feb 27–Mar 13 | 275 | two-plantings: Plant Feb 27 and again by Sep 26; both mature before Nov 29. | Sep 26 |
| Kohlrabi | — | Feb 13–Feb 27 | 289 | two-plantings: Plant Feb 13 and again by Sep 21; both mature before Nov 29. | Sep 21 |
| Bok Choy | Feb 27 | Mar 20–Mar 27 | 240 | two-plantings: Plant Mar 20 and again by Sep 17; both mature before Nov 15. | Sep 17 |
| Collards | Jan 16 | Feb 27–Mar 13 | 275 | two-plantings: Plant Feb 27 and again by Sep 16; both mature before Nov 29. | Sep 16 |
| Cantaloupe | Mar 13 | Apr 10–Apr 17 | 184 | fits: 85 days to maturity, 184 available after Apr 10. | Jul 4 |
| Chives | Jan 2 | Apr 3–Apr 10 | 240 | fits: 90 days to maturity, 240 available after Apr 3. | — |
| Dill | — | Jan 30–Apr 24 | 289 | two-plantings: Plant Jan 30 and again by Sep 7; both mature before Nov 15. | Sep 7 |
| Oregano | Jan 16 | Apr 3–Apr 10 | 240 | fits: 80 days to maturity, 240 available after Apr 3. | — |
| Rosemary | Jan 2 | Apr 3–Apr 10 | 226 | fits: 80 days to maturity, 226 available after Apr 3. | — |
| Sage | Jan 30 | Apr 3–Apr 10 | 240 | fits: 75 days to maturity, 240 available after Apr 3. | — |
| Thyme | Jan 16 | Apr 3–Apr 10 | 240 | fits: 90 days to maturity, 240 available after Apr 3. | — |
| Calendula | Feb 13 | Mar 13–Mar 27 | 247 | two-plantings: Plant Mar 13 and again by Sep 12; both mature before Nov 15. | Sep 12 |
| Cosmos | Feb 27 | Mar 27–Apr 10 | 212 | two-plantings: Plant Mar 27 and again by Aug 12; both mature before Oct 25. | Aug 12 |
| Lavender | Jan 2 | Mar 27–Apr 10 | 247 | fits: 90 days to maturity, 247 available after Mar 27. | — |
| Marigolds | Feb 13 | Mar 27–Apr 3 | 212 | two-plantings: Plant Mar 27 and again by Aug 22; both mature before Oct 25. | Aug 22 |
| Melons | Mar 13 | Apr 10–Apr 17 | 184 | fits: 85 days to maturity, 184 available after Apr 10. | Jul 4 |
| Mint | — | Mar 27–Apr 10 | 247 | fits: 90 days to maturity, 247 available after Mar 27. | — |
| Nasturtiums | Feb 27 | Mar 27–Apr 3 | 212 | two-plantings: Plant Mar 27 and again by Aug 17; both mature before Oct 25. | Aug 17 |
| Pole Beans | — | Apr 3–Apr 17 | 205 | fits: 65 days to maturity, 205 available after Apr 3. | Aug 7 |
| Spaghetti Squash | Mar 13 | Apr 10–Apr 17 | 191 | fits: 90 days to maturity, 191 available after Apr 10. | Jul 6 |
| Sunflowers | — | Mar 27–Apr 10 | 212 | fits: 70 days to maturity, 212 available after Mar 27. | Aug 2 |
| Tomatillos | Jan 30 | Apr 3–Apr 10 | 191 | fits: 75 days to maturity, 191 available after Apr 3. | Jul 14 |
| Watermelon | Mar 13 | Apr 3–Apr 10 | 191 | fits: 80 days to maturity, 191 available after Apr 3. | Jul 9 |
| Yellow Squash | Mar 13 | Apr 10–Apr 17 | 198 | two-plantings: Plant Apr 10 and again by Aug 17; both mature before Oct 25. | Aug 17 |
| Zinnias | Feb 27 | Mar 27–Apr 10 | 212 | two-plantings: Plant Mar 27 and again by Aug 12; both mature before Oct 25. | Aug 12 |
Month by month in Denison
| Month | What to do |
|---|---|
| January | Start indoors: Chives (Jan 2), Lavender (Jan 2), Onion (Jan 2), Rosemary (Jan 2), Celery (Jan 16), Collards (Jan 16), +12 more. Direct sow from: Arugula (Jan 30), Beets (Jan 30), Dill (Jan 30), Peas (Jan 30), Radish (Jan 30), Spinach (Jan 30). |
| February | Start indoors: Eggplant (Feb 6), Calendula (Feb 13), Cauliflower (Feb 13), Marigolds (Feb 13), Pepper (Feb 13), Basil (Feb 20), +7 more. Direct sow from: Kohlrabi (Feb 13), Cilantro (Feb 27), Turnip (Feb 27). Transplant from: Broccoli (Feb 27), Brussel Sprouts (Feb 27), Cabbage (Feb 27), Collards (Feb 27), Kale (Feb 27), Lettuce (Feb 27), +2 more. Plant: Strawberry (Feb 20). |
| March | Start indoors: Cucumber (Mar 6), Butternut Squash (Mar 13), Cantaloupe (Mar 13), Melons (Mar 13), Pumpkin (Mar 13), Spaghetti Squash (Mar 13), +3 more. Direct sow from: Carrots (Mar 6), Potatoes (Mar 13), Sunflowers (Mar 27). Transplant from: Calendula (Mar 13), Swiss Chard (Mar 13), Bok Choy (Mar 20), Cauliflower (Mar 20), Cosmos (Mar 27), Lavender (Mar 27), +4 more. Last frost around March 27. |
| April | Direct sow from: Beans (Apr 3), Pole Beans (Apr 3). Transplant from: Celery (Apr 3), Chives (Apr 3), Corn (Apr 3), Okra (Apr 3), Oregano (Apr 3), Parsley (Apr 3), +17 more. |
| May | Succession plant lettuce and greens. Keep beds weeded and watered consistently. |
| June | Last sowing dates: Butternut Squash (Jun 26), Pumpkin (Jun 26). |
| July | Last sowing dates: Cantaloupe (Jul 4), Celery (Jul 4), Melons (Jul 4), Spaghetti Squash (Jul 6), Tomato (Jul 9), Watermelon (Jul 9), +4 more. |
| August | Last sowing dates: Sunflowers (Aug 2), Brussel Sprouts (Aug 7), Pole Beans (Aug 7), Basil (Aug 12), Cosmos (Aug 12), Cucumber (Aug 12), +11 more. |
| September | Last sowing dates: Cabbage (Sep 6), Carrots (Sep 6), Beets (Sep 7), Dill (Sep 7), Swiss Chard (Sep 7), Calendula (Sep 12), +8 more. |
| October | Last sowing dates: Arugula (Oct 6), Spinach (Oct 6), Radish (Oct 7). |
| November | Direct sow from: Garlic (Nov 8). First frost around November 8. Last sowing dates: Garlic (Nov 29). |
| 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 Denison, TX (ZIP 75021)?
The median last spring frost date for Denison, TX (ZIP code 75021) is around March 27. 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 March 11; one in ten it runs past April 12.
What is the first fall frost date in Denison, TX?
The median first fall frost date for Denison, TX is around November 8. 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 22 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Denison, TX?
The frost-free growing season in Denison is about 226 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 Denison (226 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 Denison, TX?
Denison, TX is in USDA hardiness zone 8a (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 Denison, TX?
Start tomatoes indoors Feb 20 and plant out Apr 10 in Denison. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Denison?
Two: plant Feb 27 and again by Sep 17; both mature before Nov 15.
When do I plant garlic in Denison?
Nov 8 to Nov 29; it overwinters and is ready the following summer.
Can I get two tomato crops in Denison?
Yes: plant out Apr 10 for a summer crop, and set out a second round of transplants by Jul 9 for a fall crop.
Which nearby ZIP has a longer season?
Sherman (ZIP 75092) has 237 frost-free days, 11 more than Denison (ZIP 75021). See Sherman ZIP 75092 frost dates
Nearby and related
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