Frost Dates for Saint Clair, MO 63077
Last spring frost April 22 · First fall frost October 9 · 170 frost-free days · USDA Zone 6b
ZIP 63077 has about 11,400 people.
Moderate season: 170 frost-free days. Spring frost risk spans April 6–May 8 (32 days). Fall frost risk spans September 25–October 22 (27 days).
Frost probability for 63077
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | May 8 | April 22 | April 6 |
| Fall (first frost) | September 25 | October 9 | October 22 |
Dates come from NOAA 1971–2000 freeze probabilities at UNION (13.2 km away); the 50% date is the median year.
Which crops fit a 170-day season in Saint Clair
In Saint Clair (170 frost-free days, a moderate 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 18 | May 6–May 13 | 128 | fits: 80 days to maturity, 128 available after May 6. | Jun 9 |
| Pepper | Mar 11 | May 6–May 13 | 128 | fits: 75 days to maturity, 128 available after May 6. | Jun 14 |
| Lettuce | Feb 25 | Mar 25–Apr 1 | 205 | two-plantings: Plant Mar 25 and again by Aug 18; both mature before Oct 16. | Aug 18 |
| Carrots | — | Apr 1–Apr 8 | 212 | fits: 70 days to maturity, 212 available after Apr 1. | Aug 7 |
| Cucumber | Apr 1 | May 6–May 13 | 142 | two-plantings: Plant May 6 and again by Jul 13; both mature before Sep 25. | Jul 13 |
| Beans | — | Apr 29–May 13 | 156 | two-plantings: Plant Apr 29 and again by Jul 20; both mature before Oct 2. | Jul 20 |
| Peas | — | Feb 25–May 6 | 233 | fits: 65 days to maturity, 233 available after Feb 25. | Jul 29 |
| Zucchini | Apr 8 | May 6–May 13 | 142 | two-plantings: Plant May 6 and again by Jul 18; both mature before Sep 25. | Jul 18 |
| Onion | Jan 28 | Mar 25–Apr 8 | 205 | fits: 100 days to maturity, 205 available after Mar 25. | — |
| Spinach | — | Feb 25–Apr 15 | 247 | two-plantings: Plant Feb 25 and again by Sep 6; both mature before Oct 30. | Sep 6 |
| Kale | Feb 11 | Mar 25–Apr 8 | 219 | two-plantings: Plant Mar 25 and again by Aug 22; both mature before Oct 30. | Aug 22 |
| Broccoli | Feb 25 | Mar 25–Apr 8 | 205 | fits: 80 days to maturity, 205 available after Mar 25. | Jul 14 |
| Cabbage | Feb 25 | Mar 25–Apr 8 | 219 | fits: 70 days to maturity, 219 available after Mar 25. | Aug 7 |
| Radish | — | Feb 25–May 20 | 233 | two-plantings: Plant Feb 25 and again by Sep 7; both mature before Oct 16. | Sep 7 |
| Beets | — | Feb 25–May 20 | 233 | two-plantings: Plant Feb 25 and again by Aug 8; both mature before Oct 16. | Aug 8 |
| Potatoes | — | Apr 8–Apr 15 | 191 | fits: 90 days to maturity, 191 available after Apr 8. | — |
| Garlic | — | Oct 9 | 275 | overwinter: Plant Oct 9 to Oct 30; harvest the following summer. | Oct 30 |
| Strawberry | — | Mar 18–May 13 | 226 | perennial: A perennial: plant Mar 18; it fruits from the following year and keeps producing for several years. | — |
| Corn | Mar 25 | Apr 29–May 6 | 142 | fits: 75 days to maturity, 142 available after Apr 29. | Jun 21 |
| Pumpkin | Apr 8 | May 6–May 6 | 135 | fits: 100 days to maturity, 135 available after May 6. | May 27 |
| Cauliflower | Mar 11 | Apr 15–Apr 29 | 184 | fits: 75 days to maturity, 184 available after Apr 15. | Jul 19 |
| Swiss Chard | Feb 25 | Apr 8–Apr 8 | 191 | two-plantings: Plant Apr 8 and again by Aug 8; both mature before Oct 16. | Aug 8 |
| Arugula | — | Feb 25–May 20 | 247 | two-plantings: Plant Feb 25 and again by Sep 6; both mature before Oct 30. | Sep 6 |
| Brussel Sprouts | Feb 25 | Mar 25–Apr 8 | 219 | fits: 100 days to maturity, 219 available after Mar 25. | Jul 8 |
| Butternut Squash | Apr 8 | May 6–May 13 | 135 | fits: 100 days to maturity, 135 available after May 6. | May 27 |
| Eggplant | Mar 4 | May 6–May 13 | 128 | fits: 70 days to maturity, 128 available after May 6. | Jun 19 |
| Okra | Mar 25 | Apr 29–May 6 | 149 | two-plantings: Plant Apr 29 and again by Jul 18; both mature before Sep 25. | Jul 18 |
| Basil | Mar 18 | May 13–May 13 | 135 | two-plantings: Plant May 13 and again by Jul 13; both mature before Sep 25. | Jul 13 |
| Cilantro | — | Mar 25–Apr 15 | 205 | two-plantings: Plant Mar 25 and again by Aug 13; both mature before Oct 16. | Aug 13 |
| Parsley | Feb 11 | Apr 29–May 6 | 170 | fits: 70 days to maturity, 170 available after Apr 29. | Jul 24 |
| Celery | Feb 11 | Apr 29–May 13 | 170 | fits: 120 days to maturity, 170 available after Apr 29. | Jun 4 |
| Scallions | Feb 11 | Mar 25–Apr 8 | 219 | two-plantings: Plant Mar 25 and again by Aug 17; both mature before Oct 30. | Aug 17 |
| Turnip | — | Mar 25–Apr 8 | 219 | two-plantings: Plant Mar 25 and again by Aug 27; both mature before Oct 30. | Aug 27 |
| Kohlrabi | — | Mar 11–Mar 25 | 233 | two-plantings: Plant Mar 11 and again by Aug 22; both mature before Oct 30. | Aug 22 |
| Bok Choy | Mar 25 | Apr 15–Apr 22 | 184 | two-plantings: Plant Apr 15 and again by Aug 18; both mature before Oct 16. | Aug 18 |
| Collards | Feb 11 | Mar 25–Apr 8 | 219 | two-plantings: Plant Mar 25 and again by Aug 17; both mature before Oct 30. | Aug 17 |
| Cantaloupe | Apr 8 | May 6–May 13 | 128 | fits: 85 days to maturity, 128 available after May 6. | Jun 4 |
| Chives | Jan 28 | Apr 29–May 6 | 184 | fits: 90 days to maturity, 184 available after Apr 29. | — |
| Dill | — | Feb 25–May 20 | 233 | two-plantings: Plant Feb 25 and again by Aug 8; both mature before Oct 16. | Aug 8 |
| Oregano | Feb 11 | Apr 29–May 6 | 184 | fits: 80 days to maturity, 184 available after Apr 29. | — |
| Rosemary | Jan 28 | Apr 29–May 6 | 170 | fits: 80 days to maturity, 170 available after Apr 29. | — |
| Sage | Feb 25 | Apr 29–May 6 | 184 | fits: 75 days to maturity, 184 available after Apr 29. | — |
| Thyme | Feb 11 | Apr 29–May 6 | 184 | fits: 90 days to maturity, 184 available after Apr 29. | — |
| Calendula | Mar 11 | Apr 8–Apr 22 | 191 | two-plantings: Plant Apr 8 and again by Aug 13; both mature before Oct 16. | Aug 13 |
| Cosmos | Mar 25 | Apr 22–May 6 | 156 | two-plantings: Plant Apr 22 and again by Jul 13; both mature before Sep 25. | Jul 13 |
| Lavender | Jan 28 | Apr 22–May 6 | 191 | fits: 90 days to maturity, 191 available after Apr 22. | — |
| Marigolds | Mar 11 | Apr 22–Apr 29 | 156 | two-plantings: Plant Apr 22 and again by Jul 23; both mature before Sep 25. | Jul 23 |
| Melons | Apr 8 | May 6–May 13 | 128 | fits: 85 days to maturity, 128 available after May 6. | Jun 4 |
| Mint | — | Apr 22–May 6 | 191 | fits: 90 days to maturity, 191 available after Apr 22. | — |
| Nasturtiums | Mar 25 | Apr 22–Apr 29 | 156 | two-plantings: Plant Apr 22 and again by Jul 18; both mature before Sep 25. | Jul 18 |
| Pole Beans | — | Apr 29–May 13 | 149 | fits: 65 days to maturity, 149 available after Apr 29. | Jul 8 |
| Spaghetti Squash | Apr 8 | May 6–May 13 | 135 | fits: 90 days to maturity, 135 available after May 6. | Jun 6 |
| Sunflowers | — | Apr 22–May 6 | 156 | fits: 70 days to maturity, 156 available after Apr 22. | Jul 3 |
| Tomatillos | Feb 25 | Apr 29–May 6 | 135 | fits: 75 days to maturity, 135 available after Apr 29. | Jun 14 |
| Watermelon | Apr 8 | Apr 29–May 6 | 135 | fits: 80 days to maturity, 135 available after Apr 29. | Jun 9 |
| Yellow Squash | Apr 8 | May 6–May 13 | 142 | two-plantings: Plant May 6 and again by Jul 18; both mature before Sep 25. | Jul 18 |
| Zinnias | Mar 25 | Apr 22–May 6 | 156 | two-plantings: Plant Apr 22 and again by Jul 13; both mature before Sep 25. | Jul 13 |
Month by month in Saint Clair
| Month | What to do |
|---|---|
| January | Start indoors: Chives (Jan 28), Lavender (Jan 28), Onion (Jan 28), Rosemary (Jan 28). |
| February | Start indoors: Celery (Feb 11), Collards (Feb 11), Kale (Feb 11), Oregano (Feb 11), Parsley (Feb 11), Scallions (Feb 11), +8 more. Direct sow from: Arugula (Feb 25), Beets (Feb 25), Dill (Feb 25), Peas (Feb 25), Radish (Feb 25), Spinach (Feb 25). |
| March | Start indoors: Eggplant (Mar 4), Calendula (Mar 11), Cauliflower (Mar 11), Marigolds (Mar 11), Pepper (Mar 11), Basil (Mar 18), +7 more. Direct sow from: Kohlrabi (Mar 11), Cilantro (Mar 25), Turnip (Mar 25). Transplant from: Broccoli (Mar 25), Brussel Sprouts (Mar 25), Cabbage (Mar 25), Collards (Mar 25), Kale (Mar 25), Lettuce (Mar 25), +2 more. Plant: Strawberry (Mar 18). |
| April | Start indoors: Cucumber (Apr 1), Butternut Squash (Apr 8), Cantaloupe (Apr 8), Melons (Apr 8), Pumpkin (Apr 8), Spaghetti Squash (Apr 8), +3 more. Direct sow from: Carrots (Apr 1), Potatoes (Apr 8), Sunflowers (Apr 22), Beans (Apr 29), Pole Beans (Apr 29). Transplant from: Calendula (Apr 8), Swiss Chard (Apr 8), Bok Choy (Apr 15), Cauliflower (Apr 15), Cosmos (Apr 22), Lavender (Apr 22), +15 more. Last frost around April 22. |
| May | Transplant from: Butternut Squash (May 6), Cantaloupe (May 6), Cucumber (May 6), Eggplant (May 6), Melons (May 6), Pepper (May 6), +6 more. Last sowing dates: Butternut Squash (May 27), Pumpkin (May 27). |
| June | Last sowing dates: Cantaloupe (Jun 4), Celery (Jun 4), Melons (Jun 4), Spaghetti Squash (Jun 6), Tomato (Jun 9), Watermelon (Jun 9), +4 more. |
| July | Last sowing dates: Sunflowers (Jul 3), Brussel Sprouts (Jul 8), Pole Beans (Jul 8), Basil (Jul 13), Cosmos (Jul 13), Cucumber (Jul 13), +11 more. |
| August | Last sowing dates: Cabbage (Aug 7), Carrots (Aug 7), Beets (Aug 8), Dill (Aug 8), Swiss Chard (Aug 8), Calendula (Aug 13), +8 more. |
| September | Last sowing dates: Arugula (Sep 6), Spinach (Sep 6), Radish (Sep 7). |
| October | Direct sow from: Garlic (Oct 9). First frost around October 9. Last sowing dates: Garlic (Oct 30). |
| November | Harvest remaining cold-hardy crops: kale, carrots, and beets. Plant garlic bulbs for next year. |
| 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 Saint Clair, MO (ZIP 63077)?
The median last spring frost date for Saint Clair, MO (ZIP code 63077) is around April 22. 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 6; one in ten it runs past May 8.
What is the first fall frost date in Saint Clair, MO?
The median first fall frost date for Saint Clair, MO is around October 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 September 25 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Saint Clair, MO?
The frost-free growing season in Saint Clair is about 170 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 Saint Clair (170 frost-free days, a moderate season), 30 of 56 planner crops fit outright, 25 get two plantings, 1 crop is perennial.
What USDA hardiness zone is Saint Clair, MO?
Saint Clair, MO 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 Saint Clair, MO?
Start tomatoes indoors Mar 18 and plant out May 6 in Saint Clair. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Saint Clair?
Two: plant Mar 25 and again by Aug 18; both mature before Oct 16.
When do I plant garlic in Saint Clair?
Oct 9 to Oct 30; it overwinters and is ready the following summer.
Which nearby ZIP has a longer season?
Union (ZIP 63084) has 179 frost-free days, 9 more than Saint Clair (ZIP 63077). See Union ZIP 63084 frost dates
Nearby and related
- Frost dates for Union, MO 63084 (6.5 mi)
- Frost dates for Sullivan, MO 63080 (9.9 mi)
- Frost dates for Washington, MO 63090 (14.6 mi)
- Frost dates for Pacific, MO 63069 (17.6 mi)
- Frost dates for Hillsboro, MO 63050 (22.6 mi)
- When to plant in MO
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