Frost Dates for Denison, TX 75020
Last spring frost March 24 · First fall frost November 9 · 230 frost-free days · USDA Zone 8a
ZIP 75020 has about 24,800 people, the largest of 2 ZIP codes in Denison.
Long season: 230 frost-free days. Spring frost risk spans March 10–April 9 (30 days). Fall frost risk spans October 22–November 28 (37 days).
Frost probability for 75020
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | April 9 | March 24 | March 10 |
| Fall (first frost) | October 22 | November 9 | November 28 |
Dates come from NOAA 1971–2000 freeze probabilities at MADILL (38.7 km away); the 50% date is the median year.
Frost dates by ZIP code in Denison, TX
| ZIP | Last spring frost (50%) | First fall frost (50%) | Zone |
|---|---|---|---|
| 75020 | March 24 | November 9 | 8a |
| 75021 | March 27 | November 8 | 8a |
Which crops fit a 230-day season in Denison
In Denison (230 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 17 | Apr 7–Apr 14 | 188 | fits: 80 days to maturity, 188 available after Apr 7. | Jul 10 |
| Pepper | Feb 10 | Apr 7–Apr 14 | 188 | fits: 75 days to maturity, 188 available after Apr 7. | Jul 15 |
| Lettuce | Jan 27 | Feb 24–Mar 3 | 265 | two-plantings: Plant Feb 24 and again by Sep 18; both mature before Nov 16. | Sep 18 |
| Carrots | — | Mar 3–Mar 10 | 272 | fits: 70 days to maturity, 272 available after Mar 3. | Sep 7 |
| Cucumber | Mar 3 | Apr 7–Apr 14 | 202 | two-plantings: Plant Apr 7 and again by Aug 13; both mature before Oct 26. | Aug 13 |
| Beans | — | Mar 31–Apr 14 | 216 | two-plantings: Plant Mar 31 and again by Aug 20; both mature before Nov 2. | Aug 20 |
| Peas | — | Jan 27–Apr 7 | 293 | fits: 65 days to maturity, 293 available after Jan 27. | Aug 29 |
| Zucchini | Mar 10 | Apr 7–Apr 14 | 202 | two-plantings: Plant Apr 7 and again by Aug 18; both mature before Oct 26. | Aug 18 |
| Onion | Dec 30 | Feb 24–Mar 10 | 265 | fits: 100 days to maturity, 265 available after Feb 24. | — |
| Spinach | — | Jan 27–Mar 17 | 307 | two-plantings: Plant Jan 27 and again by Oct 7; both mature before Nov 30. | Oct 7 |
| Kale | Jan 13 | Feb 24–Mar 10 | 279 | two-plantings: Plant Feb 24 and again by Sep 22; both mature before Nov 30. | Sep 22 |
| Broccoli | Jan 27 | Feb 24–Mar 10 | 265 | fits: 80 days to maturity, 265 available after Feb 24. | Aug 14 |
| Cabbage | Jan 27 | Feb 24–Mar 10 | 279 | fits: 70 days to maturity, 279 available after Feb 24. | Sep 7 |
| Radish | — | Jan 27–Apr 21 | 293 | two-plantings: Plant Jan 27 and again by Oct 8; both mature before Nov 16. | Oct 8 |
| Beets | — | Jan 27–Apr 21 | 293 | two-plantings: Plant Jan 27 and again by Sep 8; both mature before Nov 16. | Sep 8 |
| Potatoes | — | Mar 10–Mar 17 | 251 | fits: 90 days to maturity, 251 available after Mar 10. | — |
| Garlic | — | Nov 9 | 335 | overwinter: Plant Nov 9 to Nov 30; harvest the following summer. | Nov 30 |
| Strawberry | — | Feb 17–Apr 14 | 286 | perennial: A perennial: plant Feb 17; it fruits from the following year and keeps producing for several years. | — |
| Corn | Feb 24 | Mar 31–Apr 7 | 202 | fits: 75 days to maturity, 202 available after Mar 31. | Jul 22 |
| Pumpkin | Mar 10 | Apr 7–Apr 7 | 195 | fits: 100 days to maturity, 195 available after Apr 7. | Jun 27 |
| Cauliflower | Feb 10 | Mar 17–Mar 31 | 244 | fits: 75 days to maturity, 244 available after Mar 17. | Aug 19 |
| Swiss Chard | Jan 27 | Mar 10–Mar 10 | 251 | two-plantings: Plant Mar 10 and again by Sep 8; both mature before Nov 16. | Sep 8 |
| Arugula | — | Jan 27–Apr 21 | 307 | two-plantings: Plant Jan 27 and again by Oct 7; both mature before Nov 30. | Oct 7 |
| Brussel Sprouts | Jan 27 | Feb 24–Mar 10 | 279 | fits: 100 days to maturity, 279 available after Feb 24. | Aug 8 |
| Butternut Squash | Mar 10 | Apr 7–Apr 14 | 195 | fits: 100 days to maturity, 195 available after Apr 7. | Jun 27 |
| Eggplant | Feb 3 | Apr 7–Apr 14 | 188 | fits: 70 days to maturity, 188 available after Apr 7. | Jul 20 |
| Okra | Feb 24 | Mar 31–Apr 7 | 209 | two-plantings: Plant Mar 31 and again by Aug 18; both mature before Oct 26. | Aug 18 |
| Basil | Feb 17 | Apr 14–Apr 14 | 195 | two-plantings: Plant Apr 14 and again by Aug 13; both mature before Oct 26. | Aug 13 |
| Cilantro | — | Feb 24–Mar 17 | 265 | two-plantings: Plant Feb 24 and again by Sep 13; both mature before Nov 16. | Sep 13 |
| Parsley | Jan 13 | Mar 31–Apr 7 | 230 | fits: 70 days to maturity, 230 available after Mar 31. | Aug 24 |
| Celery | Jan 13 | Mar 31–Apr 14 | 230 | fits: 120 days to maturity, 230 available after Mar 31. | Jul 5 |
| Scallions | Jan 13 | Feb 24–Mar 10 | 279 | two-plantings: Plant Feb 24 and again by Sep 17; both mature before Nov 30. | Sep 17 |
| Turnip | — | Feb 24–Mar 10 | 279 | two-plantings: Plant Feb 24 and again by Sep 27; both mature before Nov 30. | Sep 27 |
| Kohlrabi | — | Feb 10–Feb 24 | 293 | two-plantings: Plant Feb 10 and again by Sep 22; both mature before Nov 30. | Sep 22 |
| Bok Choy | Feb 24 | Mar 17–Mar 24 | 244 | two-plantings: Plant Mar 17 and again by Sep 18; both mature before Nov 16. | Sep 18 |
| Collards | Jan 13 | Feb 24–Mar 10 | 279 | two-plantings: Plant Feb 24 and again by Sep 17; both mature before Nov 30. | Sep 17 |
| Cantaloupe | Mar 10 | Apr 7–Apr 14 | 188 | fits: 85 days to maturity, 188 available after Apr 7. | Jul 5 |
| Chives | Dec 30 | Mar 31–Apr 7 | 244 | fits: 90 days to maturity, 244 available after Mar 31. | — |
| Dill | — | Jan 27–Apr 21 | 293 | two-plantings: Plant Jan 27 and again by Sep 8; both mature before Nov 16. | Sep 8 |
| Oregano | Jan 13 | Mar 31–Apr 7 | 244 | fits: 80 days to maturity, 244 available after Mar 31. | — |
| Rosemary | Dec 30 | Mar 31–Apr 7 | 230 | fits: 80 days to maturity, 230 available after Mar 31. | — |
| Sage | Jan 27 | Mar 31–Apr 7 | 244 | fits: 75 days to maturity, 244 available after Mar 31. | — |
| Thyme | Jan 13 | Mar 31–Apr 7 | 244 | fits: 90 days to maturity, 244 available after Mar 31. | — |
| Calendula | Feb 10 | Mar 10–Mar 24 | 251 | two-plantings: Plant Mar 10 and again by Sep 13; both mature before Nov 16. | Sep 13 |
| Cosmos | Feb 24 | Mar 24–Apr 7 | 216 | two-plantings: Plant Mar 24 and again by Aug 13; both mature before Oct 26. | Aug 13 |
| Lavender | Dec 30 | Mar 24–Apr 7 | 251 | fits: 90 days to maturity, 251 available after Mar 24. | — |
| Marigolds | Feb 10 | Mar 24–Mar 31 | 216 | two-plantings: Plant Mar 24 and again by Aug 23; both mature before Oct 26. | Aug 23 |
| Melons | Mar 10 | Apr 7–Apr 14 | 188 | fits: 85 days to maturity, 188 available after Apr 7. | Jul 5 |
| Mint | — | Mar 24–Apr 7 | 251 | fits: 90 days to maturity, 251 available after Mar 24. | — |
| Nasturtiums | Feb 24 | Mar 24–Mar 31 | 216 | two-plantings: Plant Mar 24 and again by Aug 18; both mature before Oct 26. | Aug 18 |
| Pole Beans | — | Mar 31–Apr 14 | 209 | fits: 65 days to maturity, 209 available after Mar 31. | Aug 8 |
| Spaghetti Squash | Mar 10 | Apr 7–Apr 14 | 195 | fits: 90 days to maturity, 195 available after Apr 7. | Jul 7 |
| Sunflowers | — | Mar 24–Apr 7 | 216 | fits: 70 days to maturity, 216 available after Mar 24. | Aug 3 |
| Tomatillos | Jan 27 | Mar 31–Apr 7 | 195 | fits: 75 days to maturity, 195 available after Mar 31. | Jul 15 |
| Watermelon | Mar 10 | Mar 31–Apr 7 | 195 | fits: 80 days to maturity, 195 available after Mar 31. | Jul 10 |
| Yellow Squash | Mar 10 | Apr 7–Apr 14 | 202 | two-plantings: Plant Apr 7 and again by Aug 18; both mature before Oct 26. | Aug 18 |
| Zinnias | Feb 24 | Mar 24–Apr 7 | 216 | two-plantings: Plant Mar 24 and again by Aug 13; both mature before Oct 26. | Aug 13 |
Month by month in Denison
| Month | What to do |
|---|---|
| January | Start indoors: Celery (Jan 13), Collards (Jan 13), Kale (Jan 13), Oregano (Jan 13), Parsley (Jan 13), Scallions (Jan 13), +8 more. Direct sow from: Arugula (Jan 27), Beets (Jan 27), Dill (Jan 27), Peas (Jan 27), Radish (Jan 27), Spinach (Jan 27). |
| February | Start indoors: Eggplant (Feb 3), Calendula (Feb 10), Cauliflower (Feb 10), Marigolds (Feb 10), Pepper (Feb 10), Basil (Feb 17), +7 more. Direct sow from: Kohlrabi (Feb 10), Cilantro (Feb 24), Turnip (Feb 24). Transplant from: Broccoli (Feb 24), Brussel Sprouts (Feb 24), Cabbage (Feb 24), Collards (Feb 24), Kale (Feb 24), Lettuce (Feb 24), +2 more. Plant: Strawberry (Feb 17). |
| March | Start indoors: Cucumber (Mar 3), Butternut Squash (Mar 10), Cantaloupe (Mar 10), Melons (Mar 10), Pumpkin (Mar 10), Spaghetti Squash (Mar 10), +3 more. Direct sow from: Carrots (Mar 3), Potatoes (Mar 10), Sunflowers (Mar 24), Beans (Mar 31), Pole Beans (Mar 31). Transplant from: Calendula (Mar 10), Swiss Chard (Mar 10), Bok Choy (Mar 17), Cauliflower (Mar 17), Cosmos (Mar 24), Lavender (Mar 24), +15 more. Last frost around March 24. |
| April | Transplant from: Butternut Squash (Apr 7), Cantaloupe (Apr 7), Cucumber (Apr 7), Eggplant (Apr 7), Melons (Apr 7), Pepper (Apr 7), +6 more. |
| May | Succession plant lettuce and greens. Keep beds weeded and watered consistently. |
| June | Last sowing dates: Butternut Squash (Jun 27), Pumpkin (Jun 27). |
| July | Last sowing dates: Cantaloupe (Jul 5), Celery (Jul 5), Melons (Jul 5), Spaghetti Squash (Jul 7), Tomato (Jul 10), Watermelon (Jul 10), +4 more. |
| August | Last sowing dates: Sunflowers (Aug 3), Brussel Sprouts (Aug 8), Pole Beans (Aug 8), Basil (Aug 13), Cosmos (Aug 13), Cucumber (Aug 13), +11 more. |
| September | Last sowing dates: Cabbage (Sep 7), Carrots (Sep 7), Beets (Sep 8), Dill (Sep 8), Swiss Chard (Sep 8), Calendula (Sep 13), +8 more. |
| October | Last sowing dates: Arugula (Oct 7), Spinach (Oct 7), Radish (Oct 8). |
| November | Direct sow from: Garlic (Nov 9). First frost around November 9. Last sowing dates: Garlic (Nov 30). |
| December | Start indoors: Chives (Dec 30), Lavender (Dec 30), Onion (Dec 30), Rosemary (Dec 30). |
Frequently Asked Questions
What is the last frost date for Denison, TX (ZIP 75020)?
The median last spring frost date for Denison, TX (ZIP code 75020) is around March 24. 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 10; one in ten it runs past April 9.
What is the first fall frost date in Denison, TX?
The median first fall frost date for Denison, TX is around November 9. 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 230 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 (230 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 17 and plant out Apr 7 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 24 and again by Sep 18; both mature before Nov 16.
When do I plant garlic in Denison?
Nov 9 to Nov 30; it overwinters and is ready the following summer.
Can I get two tomato crops in Denison?
Yes: plant out Apr 7 for a summer crop, and set out a second round of transplants by Jul 10 for a fall crop.
Which nearby ZIP has a longer season?
Sherman (ZIP 75092) has 237 frost-free days, 7 more than Denison (ZIP 75020). See Sherman ZIP 75092 frost dates
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