Frost Dates for Altus, OK 73521
Last spring frost April 5 · First fall frost November 3 · 212 frost-free days · USDA Zone 7b
ZIP 73521 has about 20,200 people.
Long season: 212 frost-free days. Spring frost risk spans March 26–April 14 (19 days). Fall frost risk spans October 14–November 21 (38 days).
Frost probability for 73521
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | April 14 | April 5 | March 26 |
| Fall (first frost) | October 14 | November 3 | November 21 |
Dates come from NOAA 1971–2000 freeze probabilities at ALTUS IRIG RSCH STN (5.3 km away); the 50% date is the median year.
Which crops fit a 212-day season in Altus
In Altus (212 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 1 | Apr 19–Apr 26 | 170 | fits: 80 days to maturity, 170 available after Apr 19. | Jul 4 |
| Pepper | Feb 22 | Apr 19–Apr 26 | 170 | fits: 75 days to maturity, 170 available after Apr 19. | Jul 9 |
| Lettuce | Feb 8 | Mar 8–Mar 15 | 247 | two-plantings: Plant Mar 8 and again by Sep 12; both mature before Nov 10. | Sep 12 |
| Carrots | — | Mar 15–Mar 22 | 254 | fits: 70 days to maturity, 254 available after Mar 15. | Sep 1 |
| Cucumber | Mar 15 | Apr 19–Apr 26 | 184 | two-plantings: Plant Apr 19 and again by Aug 7; both mature before Oct 20. | Aug 7 |
| Beans | — | Apr 12–Apr 26 | 198 | two-plantings: Plant Apr 12 and again by Aug 14; both mature before Oct 27. | Aug 14 |
| Peas | — | Feb 8–Apr 19 | 275 | fits: 65 days to maturity, 275 available after Feb 8. | Aug 23 |
| Zucchini | Mar 22 | Apr 19–Apr 26 | 184 | two-plantings: Plant Apr 19 and again by Aug 12; both mature before Oct 20. | Aug 12 |
| Onion | Jan 11 | Mar 8–Mar 22 | 247 | fits: 100 days to maturity, 247 available after Mar 8. | — |
| Spinach | — | Feb 8–Mar 29 | 289 | two-plantings: Plant Feb 8 and again by Oct 1; both mature before Nov 24. | Oct 1 |
| Kale | Jan 25 | Mar 8–Mar 22 | 261 | two-plantings: Plant Mar 8 and again by Sep 16; both mature before Nov 24. | Sep 16 |
| Broccoli | Feb 8 | Mar 8–Mar 22 | 247 | fits: 80 days to maturity, 247 available after Mar 8. | Aug 8 |
| Cabbage | Feb 8 | Mar 8–Mar 22 | 261 | fits: 70 days to maturity, 261 available after Mar 8. | Sep 1 |
| Radish | — | Feb 8–May 3 | 275 | two-plantings: Plant Feb 8 and again by Oct 2; both mature before Nov 10. | Oct 2 |
| Beets | — | Feb 8–May 3 | 275 | two-plantings: Plant Feb 8 and again by Sep 2; both mature before Nov 10. | Sep 2 |
| Potatoes | — | Mar 22–Mar 29 | 233 | fits: 90 days to maturity, 233 available after Mar 22. | — |
| Garlic | — | Nov 3 | 317 | overwinter: Plant Nov 3 to Nov 24; harvest the following summer. | Nov 24 |
| Strawberry | — | Mar 1–Apr 26 | 268 | perennial: A perennial: plant Mar 1; it fruits from the following year and keeps producing for several years. | — |
| Corn | Mar 8 | Apr 12–Apr 19 | 184 | fits: 75 days to maturity, 184 available after Apr 12. | Jul 16 |
| Pumpkin | Mar 22 | Apr 19–Apr 19 | 177 | fits: 100 days to maturity, 177 available after Apr 19. | Jun 21 |
| Cauliflower | Feb 22 | Mar 29–Apr 12 | 226 | fits: 75 days to maturity, 226 available after Mar 29. | Aug 13 |
| Swiss Chard | Feb 8 | Mar 22–Mar 22 | 233 | two-plantings: Plant Mar 22 and again by Sep 2; both mature before Nov 10. | Sep 2 |
| Arugula | — | Feb 8–May 3 | 289 | two-plantings: Plant Feb 8 and again by Oct 1; both mature before Nov 24. | Oct 1 |
| Brussel Sprouts | Feb 8 | Mar 8–Mar 22 | 261 | fits: 100 days to maturity, 261 available after Mar 8. | Aug 2 |
| Butternut Squash | Mar 22 | Apr 19–Apr 26 | 177 | fits: 100 days to maturity, 177 available after Apr 19. | Jun 21 |
| Eggplant | Feb 15 | Apr 19–Apr 26 | 170 | fits: 70 days to maturity, 170 available after Apr 19. | Jul 14 |
| Okra | Mar 8 | Apr 12–Apr 19 | 191 | two-plantings: Plant Apr 12 and again by Aug 12; both mature before Oct 20. | Aug 12 |
| Basil | Mar 1 | Apr 26–Apr 26 | 177 | two-plantings: Plant Apr 26 and again by Aug 7; both mature before Oct 20. | Aug 7 |
| Cilantro | — | Mar 8–Mar 29 | 247 | two-plantings: Plant Mar 8 and again by Sep 7; both mature before Nov 10. | Sep 7 |
| Parsley | Jan 25 | Apr 12–Apr 19 | 212 | fits: 70 days to maturity, 212 available after Apr 12. | Aug 18 |
| Celery | Jan 25 | Apr 12–Apr 26 | 212 | fits: 120 days to maturity, 212 available after Apr 12. | Jun 29 |
| Scallions | Jan 25 | Mar 8–Mar 22 | 261 | two-plantings: Plant Mar 8 and again by Sep 11; both mature before Nov 24. | Sep 11 |
| Turnip | — | Mar 8–Mar 22 | 261 | two-plantings: Plant Mar 8 and again by Sep 21; both mature before Nov 24. | Sep 21 |
| Kohlrabi | — | Feb 22–Mar 8 | 275 | two-plantings: Plant Feb 22 and again by Sep 16; both mature before Nov 24. | Sep 16 |
| Bok Choy | Mar 8 | Mar 29–Apr 5 | 226 | two-plantings: Plant Mar 29 and again by Sep 12; both mature before Nov 10. | Sep 12 |
| Collards | Jan 25 | Mar 8–Mar 22 | 261 | two-plantings: Plant Mar 8 and again by Sep 11; both mature before Nov 24. | Sep 11 |
| Cantaloupe | Mar 22 | Apr 19–Apr 26 | 170 | fits: 85 days to maturity, 170 available after Apr 19. | Jun 29 |
| Chives | Jan 11 | Apr 12–Apr 19 | 226 | fits: 90 days to maturity, 226 available after Apr 12. | — |
| Dill | — | Feb 8–May 3 | 275 | two-plantings: Plant Feb 8 and again by Sep 2; both mature before Nov 10. | Sep 2 |
| Oregano | Jan 25 | Apr 12–Apr 19 | 226 | fits: 80 days to maturity, 226 available after Apr 12. | — |
| Rosemary | Jan 11 | Apr 12–Apr 19 | 212 | fits: 80 days to maturity, 212 available after Apr 12. | — |
| Sage | Feb 8 | Apr 12–Apr 19 | 226 | fits: 75 days to maturity, 226 available after Apr 12. | — |
| Thyme | Jan 25 | Apr 12–Apr 19 | 226 | fits: 90 days to maturity, 226 available after Apr 12. | — |
| Calendula | Feb 22 | Mar 22–Apr 5 | 233 | two-plantings: Plant Mar 22 and again by Sep 7; both mature before Nov 10. | Sep 7 |
| Cosmos | Mar 8 | Apr 5–Apr 19 | 198 | two-plantings: Plant Apr 5 and again by Aug 7; both mature before Oct 20. | Aug 7 |
| Lavender | Jan 11 | Apr 5–Apr 19 | 233 | fits: 90 days to maturity, 233 available after Apr 5. | — |
| Marigolds | Feb 22 | Apr 5–Apr 12 | 198 | two-plantings: Plant Apr 5 and again by Aug 17; both mature before Oct 20. | Aug 17 |
| Melons | Mar 22 | Apr 19–Apr 26 | 170 | fits: 85 days to maturity, 170 available after Apr 19. | Jun 29 |
| Mint | — | Apr 5–Apr 19 | 233 | fits: 90 days to maturity, 233 available after Apr 5. | — |
| Nasturtiums | Mar 8 | Apr 5–Apr 12 | 198 | two-plantings: Plant Apr 5 and again by Aug 12; both mature before Oct 20. | Aug 12 |
| Pole Beans | — | Apr 12–Apr 26 | 191 | fits: 65 days to maturity, 191 available after Apr 12. | Aug 2 |
| Spaghetti Squash | Mar 22 | Apr 19–Apr 26 | 177 | fits: 90 days to maturity, 177 available after Apr 19. | Jul 1 |
| Sunflowers | — | Apr 5–Apr 19 | 198 | fits: 70 days to maturity, 198 available after Apr 5. | Jul 28 |
| Tomatillos | Feb 8 | Apr 12–Apr 19 | 177 | fits: 75 days to maturity, 177 available after Apr 12. | Jul 9 |
| Watermelon | Mar 22 | Apr 12–Apr 19 | 177 | fits: 80 days to maturity, 177 available after Apr 12. | Jul 4 |
| Yellow Squash | Mar 22 | Apr 19–Apr 26 | 184 | two-plantings: Plant Apr 19 and again by Aug 12; both mature before Oct 20. | Aug 12 |
| Zinnias | Mar 8 | Apr 5–Apr 19 | 198 | two-plantings: Plant Apr 5 and again by Aug 7; both mature before Oct 20. | Aug 7 |
Month by month in Altus
| Month | What to do |
|---|---|
| January | Start indoors: Chives (Jan 11), Lavender (Jan 11), Onion (Jan 11), Rosemary (Jan 11), Celery (Jan 25), Collards (Jan 25), +5 more. |
| February | Start indoors: Broccoli (Feb 8), Brussel Sprouts (Feb 8), Cabbage (Feb 8), Lettuce (Feb 8), Sage (Feb 8), Swiss Chard (Feb 8), +6 more. Direct sow from: Arugula (Feb 8), Beets (Feb 8), Dill (Feb 8), Peas (Feb 8), Radish (Feb 8), Spinach (Feb 8), +1 more. |
| March | Start indoors: Basil (Mar 1), Tomato (Mar 1), Bok Choy (Mar 8), Corn (Mar 8), Cosmos (Mar 8), Nasturtiums (Mar 8), +11 more. Direct sow from: Cilantro (Mar 8), Turnip (Mar 8), Carrots (Mar 15), Potatoes (Mar 22). Transplant from: Broccoli (Mar 8), Brussel Sprouts (Mar 8), Cabbage (Mar 8), Collards (Mar 8), Kale (Mar 8), Lettuce (Mar 8), +6 more. Plant: Strawberry (Mar 1). |
| April | Direct sow from: Sunflowers (Apr 5), Beans (Apr 12), Pole Beans (Apr 12). Transplant from: Cosmos (Apr 5), Lavender (Apr 5), Marigolds (Apr 5), Mint (Apr 5), Nasturtiums (Apr 5), Zinnias (Apr 5), +23 more. Last frost around April 5. |
| May | Frost has passed. Transplant tomatoes, peppers, and basil outdoors. Direct sow beans, cucumbers, squash, and zucchini. |
| June | Last sowing dates: Butternut Squash (Jun 21), Pumpkin (Jun 21), Cantaloupe (Jun 29), Celery (Jun 29), Melons (Jun 29). |
| July | Last sowing dates: Spaghetti Squash (Jul 1), Tomato (Jul 4), Watermelon (Jul 4), Pepper (Jul 9), Tomatillos (Jul 9), Eggplant (Jul 14), +2 more. |
| August | Last sowing dates: Brussel Sprouts (Aug 2), Pole Beans (Aug 2), Basil (Aug 7), Cosmos (Aug 7), Cucumber (Aug 7), Zinnias (Aug 7), +10 more. |
| September | Last sowing dates: Cabbage (Sep 1), Carrots (Sep 1), Beets (Sep 2), Dill (Sep 2), Swiss Chard (Sep 2), Calendula (Sep 7), +8 more. |
| October | Last sowing dates: Arugula (Oct 1), Spinach (Oct 1), Radish (Oct 2). |
| November | Direct sow from: Garlic (Nov 3). First frost around November 3. Last sowing dates: Garlic (Nov 24). |
| 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 Altus, OK (ZIP 73521)?
The median last spring frost date for Altus, OK (ZIP code 73521) is around April 5. 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 26; one in ten it runs past April 14.
What is the first fall frost date in Altus, OK?
The median first fall frost date for Altus, OK is around November 3. 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 14 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Altus, OK?
The frost-free growing season in Altus is about 212 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 Altus (212 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 Altus, OK?
Altus, OK 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 Altus, OK?
Start tomatoes indoors Mar 1 and plant out Apr 19 in Altus. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Altus?
Two: plant Mar 8 and again by Sep 12; both mature before Nov 10.
When do I plant garlic in Altus?
Nov 3 to Nov 24; it overwinters and is ready the following summer.
Can I get two tomato crops in Altus?
Yes: plant out Apr 19 for a summer crop, and set out a second round of transplants by Jul 4 for a fall crop.
Which nearby ZIP has a longer season?
Vernon (ZIP 76384) has 225 frost-free days, 13 more than Altus (ZIP 73521). See Vernon ZIP 76384 frost dates
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