Frost Dates for Mascoutah, IL 62258
Last spring frost April 11 · First fall frost October 19 · 191 frost-free days · USDA Zone 6b
ZIP 62258 has about 10,400 people.
Long season: 191 frost-free days. Spring frost risk spans March 28–April 25 (28 days). Fall frost risk spans October 3–November 4 (32 days).
Frost probability for 62258
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | April 25 | April 11 | March 28 |
| Fall (first frost) | October 3 | October 19 | November 4 |
Dates come from NOAA 1971–2000 freeze probabilities at SPARTA 1 W (38.5 km away); the 50% date is the median year.
Which crops fit a 191-day season in Mascoutah
In Mascoutah (191 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 7 | Apr 25–May 2 | 149 | fits: 80 days to maturity, 149 available after Apr 25. | Jun 19 |
| Pepper | Feb 28 | Apr 25–May 2 | 149 | fits: 75 days to maturity, 149 available after Apr 25. | Jun 24 |
| Lettuce | Feb 14 | Mar 14–Mar 21 | 226 | two-plantings: Plant Mar 14 and again by Aug 28; both mature before Oct 26. | Aug 28 |
| Carrots | — | Mar 21–Mar 28 | 233 | fits: 70 days to maturity, 233 available after Mar 21. | Aug 17 |
| Cucumber | Mar 21 | Apr 25–May 2 | 163 | two-plantings: Plant Apr 25 and again by Jul 23; both mature before Oct 5. | Jul 23 |
| Beans | — | Apr 18–May 2 | 177 | two-plantings: Plant Apr 18 and again by Jul 30; both mature before Oct 12. | Jul 30 |
| Peas | — | Feb 14–Apr 25 | 254 | fits: 65 days to maturity, 254 available after Feb 14. | Aug 8 |
| Zucchini | Mar 28 | Apr 25–May 2 | 163 | two-plantings: Plant Apr 25 and again by Jul 28; both mature before Oct 5. | Jul 28 |
| Onion | Jan 17 | Mar 14–Mar 28 | 226 | fits: 100 days to maturity, 226 available after Mar 14. | — |
| Spinach | — | Feb 14–Apr 4 | 268 | two-plantings: Plant Feb 14 and again by Sep 16; both mature before Nov 9. | Sep 16 |
| Kale | Jan 31 | Mar 14–Mar 28 | 240 | two-plantings: Plant Mar 14 and again by Sep 1; both mature before Nov 9. | Sep 1 |
| Broccoli | Feb 14 | Mar 14–Mar 28 | 226 | fits: 80 days to maturity, 226 available after Mar 14. | Jul 24 |
| Cabbage | Feb 14 | Mar 14–Mar 28 | 240 | fits: 70 days to maturity, 240 available after Mar 14. | Aug 17 |
| Radish | — | Feb 14–May 9 | 254 | two-plantings: Plant Feb 14 and again by Sep 17; both mature before Oct 26. | Sep 17 |
| Beets | — | Feb 14–May 9 | 254 | two-plantings: Plant Feb 14 and again by Aug 18; both mature before Oct 26. | Aug 18 |
| Potatoes | — | Mar 28–Apr 4 | 212 | fits: 90 days to maturity, 212 available after Mar 28. | — |
| Garlic | — | Oct 19 | 296 | overwinter: Plant Oct 19 to Nov 9; harvest the following summer. | Nov 9 |
| Strawberry | — | Mar 7–May 2 | 247 | perennial: A perennial: plant Mar 7; it fruits from the following year and keeps producing for several years. | — |
| Corn | Mar 14 | Apr 18–Apr 25 | 163 | fits: 75 days to maturity, 163 available after Apr 18. | Jul 1 |
| Pumpkin | Mar 28 | Apr 25–Apr 25 | 156 | fits: 100 days to maturity, 156 available after Apr 25. | Jun 6 |
| Cauliflower | Feb 28 | Apr 4–Apr 18 | 205 | fits: 75 days to maturity, 205 available after Apr 4. | Jul 29 |
| Swiss Chard | Feb 14 | Mar 28–Mar 28 | 212 | two-plantings: Plant Mar 28 and again by Aug 18; both mature before Oct 26. | Aug 18 |
| Arugula | — | Feb 14–May 9 | 268 | two-plantings: Plant Feb 14 and again by Sep 16; both mature before Nov 9. | Sep 16 |
| Brussel Sprouts | Feb 14 | Mar 14–Mar 28 | 240 | fits: 100 days to maturity, 240 available after Mar 14. | Jul 18 |
| Butternut Squash | Mar 28 | Apr 25–May 2 | 156 | fits: 100 days to maturity, 156 available after Apr 25. | Jun 6 |
| Eggplant | Feb 21 | Apr 25–May 2 | 149 | fits: 70 days to maturity, 149 available after Apr 25. | Jun 29 |
| Okra | Mar 14 | Apr 18–Apr 25 | 170 | two-plantings: Plant Apr 18 and again by Jul 28; both mature before Oct 5. | Jul 28 |
| Basil | Mar 7 | May 2–May 2 | 156 | two-plantings: Plant May 2 and again by Jul 23; both mature before Oct 5. | Jul 23 |
| Cilantro | — | Mar 14–Apr 4 | 226 | two-plantings: Plant Mar 14 and again by Aug 23; both mature before Oct 26. | Aug 23 |
| Parsley | Jan 31 | Apr 18–Apr 25 | 191 | fits: 70 days to maturity, 191 available after Apr 18. | Aug 3 |
| Celery | Jan 31 | Apr 18–May 2 | 191 | fits: 120 days to maturity, 191 available after Apr 18. | Jun 14 |
| Scallions | Jan 31 | Mar 14–Mar 28 | 240 | two-plantings: Plant Mar 14 and again by Aug 27; both mature before Nov 9. | Aug 27 |
| Turnip | — | Mar 14–Mar 28 | 240 | two-plantings: Plant Mar 14 and again by Sep 6; both mature before Nov 9. | Sep 6 |
| Kohlrabi | — | Feb 28–Mar 14 | 254 | two-plantings: Plant Feb 28 and again by Sep 1; both mature before Nov 9. | Sep 1 |
| Bok Choy | Mar 14 | Apr 4–Apr 11 | 205 | two-plantings: Plant Apr 4 and again by Aug 28; both mature before Oct 26. | Aug 28 |
| Collards | Jan 31 | Mar 14–Mar 28 | 240 | two-plantings: Plant Mar 14 and again by Aug 27; both mature before Nov 9. | Aug 27 |
| Cantaloupe | Mar 28 | Apr 25–May 2 | 149 | fits: 85 days to maturity, 149 available after Apr 25. | Jun 14 |
| Chives | Jan 17 | Apr 18–Apr 25 | 205 | fits: 90 days to maturity, 205 available after Apr 18. | — |
| Dill | — | Feb 14–May 9 | 254 | two-plantings: Plant Feb 14 and again by Aug 18; both mature before Oct 26. | Aug 18 |
| Oregano | Jan 31 | Apr 18–Apr 25 | 205 | fits: 80 days to maturity, 205 available after Apr 18. | — |
| Rosemary | Jan 17 | Apr 18–Apr 25 | 191 | fits: 80 days to maturity, 191 available after Apr 18. | — |
| Sage | Feb 14 | Apr 18–Apr 25 | 205 | fits: 75 days to maturity, 205 available after Apr 18. | — |
| Thyme | Jan 31 | Apr 18–Apr 25 | 205 | fits: 90 days to maturity, 205 available after Apr 18. | — |
| Calendula | Feb 28 | Mar 28–Apr 11 | 212 | two-plantings: Plant Mar 28 and again by Aug 23; both mature before Oct 26. | Aug 23 |
| Cosmos | Mar 14 | Apr 11–Apr 25 | 177 | two-plantings: Plant Apr 11 and again by Jul 23; both mature before Oct 5. | Jul 23 |
| Lavender | Jan 17 | Apr 11–Apr 25 | 212 | fits: 90 days to maturity, 212 available after Apr 11. | — |
| Marigolds | Feb 28 | Apr 11–Apr 18 | 177 | two-plantings: Plant Apr 11 and again by Aug 2; both mature before Oct 5. | Aug 2 |
| Melons | Mar 28 | Apr 25–May 2 | 149 | fits: 85 days to maturity, 149 available after Apr 25. | Jun 14 |
| Mint | — | Apr 11–Apr 25 | 212 | fits: 90 days to maturity, 212 available after Apr 11. | — |
| Nasturtiums | Mar 14 | Apr 11–Apr 18 | 177 | two-plantings: Plant Apr 11 and again by Jul 28; both mature before Oct 5. | Jul 28 |
| Pole Beans | — | Apr 18–May 2 | 170 | fits: 65 days to maturity, 170 available after Apr 18. | Jul 18 |
| Spaghetti Squash | Mar 28 | Apr 25–May 2 | 156 | fits: 90 days to maturity, 156 available after Apr 25. | Jun 16 |
| Sunflowers | — | Apr 11–Apr 25 | 177 | fits: 70 days to maturity, 177 available after Apr 11. | Jul 13 |
| Tomatillos | Feb 14 | Apr 18–Apr 25 | 156 | fits: 75 days to maturity, 156 available after Apr 18. | Jun 24 |
| Watermelon | Mar 28 | Apr 18–Apr 25 | 156 | fits: 80 days to maturity, 156 available after Apr 18. | Jun 19 |
| Yellow Squash | Mar 28 | Apr 25–May 2 | 163 | two-plantings: Plant Apr 25 and again by Jul 28; both mature before Oct 5. | Jul 28 |
| Zinnias | Mar 14 | Apr 11–Apr 25 | 177 | two-plantings: Plant Apr 11 and again by Jul 23; both mature before Oct 5. | Jul 23 |
Month by month in Mascoutah
| Month | What to do |
|---|---|
| January | Start indoors: Chives (Jan 17), Lavender (Jan 17), Onion (Jan 17), Rosemary (Jan 17), Celery (Jan 31), Collards (Jan 31), +5 more. |
| February | Start indoors: Broccoli (Feb 14), Brussel Sprouts (Feb 14), Cabbage (Feb 14), Lettuce (Feb 14), Sage (Feb 14), Swiss Chard (Feb 14), +6 more. Direct sow from: Arugula (Feb 14), Beets (Feb 14), Dill (Feb 14), Peas (Feb 14), Radish (Feb 14), Spinach (Feb 14), +1 more. |
| March | Start indoors: Basil (Mar 7), Tomato (Mar 7), Bok Choy (Mar 14), Corn (Mar 14), Cosmos (Mar 14), Nasturtiums (Mar 14), +11 more. Direct sow from: Cilantro (Mar 14), Turnip (Mar 14), Carrots (Mar 21), Potatoes (Mar 28). Transplant from: Broccoli (Mar 14), Brussel Sprouts (Mar 14), Cabbage (Mar 14), Collards (Mar 14), Kale (Mar 14), Lettuce (Mar 14), +4 more. Plant: Strawberry (Mar 7). |
| April | Direct sow from: Sunflowers (Apr 11), Beans (Apr 18), Pole Beans (Apr 18). Transplant from: Bok Choy (Apr 4), Cauliflower (Apr 4), Cosmos (Apr 11), Lavender (Apr 11), Marigolds (Apr 11), Mint (Apr 11), +24 more. Last frost around April 11. |
| May | Transplant from: Basil (May 2). |
| June | Last sowing dates: Butternut Squash (Jun 6), Pumpkin (Jun 6), Cantaloupe (Jun 14), Celery (Jun 14), Melons (Jun 14), Spaghetti Squash (Jun 16), +5 more. |
| July | Last sowing dates: Corn (Jul 1), Sunflowers (Jul 13), Brussel Sprouts (Jul 18), Pole Beans (Jul 18), Basil (Jul 23), Cosmos (Jul 23), +9 more. |
| August | Last sowing dates: Marigolds (Aug 2), Parsley (Aug 3), Peas (Aug 8), Cabbage (Aug 17), Carrots (Aug 17), Beets (Aug 18), +8 more. |
| September | Last sowing dates: Kale (Sep 1), Kohlrabi (Sep 1), Turnip (Sep 6), Arugula (Sep 16), Spinach (Sep 16), Radish (Sep 17). |
| October | Direct sow from: Garlic (Oct 19). First frost around October 19. |
| November | Last sowing dates: Garlic (Nov 9). |
| 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 Mascoutah, IL (ZIP 62258)?
The median last spring frost date for Mascoutah, IL (ZIP code 62258) is around April 11. 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 28; one in ten it runs past April 25.
What is the first fall frost date in Mascoutah, IL?
The median first fall frost date for Mascoutah, IL is around October 19. 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 3 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Mascoutah, IL?
The frost-free growing season in Mascoutah is about 191 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 Mascoutah (191 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 Mascoutah, IL?
Mascoutah, IL is in USDA hardiness zone 6b (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 Mascoutah, IL?
Start tomatoes indoors Mar 7 and plant out Apr 25 in Mascoutah. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Mascoutah?
Two: plant Mar 14 and again by Aug 28; both mature before Oct 26.
When do I plant garlic in Mascoutah?
Oct 19 to Nov 9; it overwinters and is ready the following summer.
Can I get two tomato crops in Mascoutah?
Yes: plant out Apr 25 for a summer crop, and set out a second round of transplants by Jun 19 for a fall crop.
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