Frost Dates for Lake Saint Louis, MO 63367
Last spring frost April 12 · First fall frost October 15 · 186 frost-free days · USDA Zone 6b
ZIP 63367 has about 29,700 people.
Long season: 186 frost-free days. Spring frost risk spans March 29–April 27 (29 days). Fall frost risk spans September 29–October 31 (32 days).
Frost probability for 63367
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | April 27 | April 12 | March 29 |
| Fall (first frost) | September 29 | October 15 | October 31 |
Dates come from NOAA 1971–2000 freeze probabilities at ST CHARLES ELM PT (24.7 km away); the 50% date is the median year.
Which crops fit a 186-day season in Lake Saint Louis
In Lake Saint Louis (186 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 8 | Apr 26–May 3 | 144 | fits: 80 days to maturity, 144 available after Apr 26. | Jun 15 |
| Pepper | Mar 1 | Apr 26–May 3 | 144 | fits: 75 days to maturity, 144 available after Apr 26. | Jun 20 |
| Lettuce | Feb 15 | Mar 15–Mar 22 | 221 | two-plantings: Plant Mar 15 and again by Aug 24; both mature before Oct 22. | Aug 24 |
| Carrots | — | Mar 22–Mar 29 | 228 | fits: 70 days to maturity, 228 available after Mar 22. | Aug 13 |
| Cucumber | Mar 22 | Apr 26–May 3 | 158 | two-plantings: Plant Apr 26 and again by Jul 19; both mature before Oct 1. | Jul 19 |
| Beans | — | Apr 19–May 3 | 172 | two-plantings: Plant Apr 19 and again by Jul 26; both mature before Oct 8. | Jul 26 |
| Peas | — | Feb 15–Apr 26 | 249 | fits: 65 days to maturity, 249 available after Feb 15. | Aug 4 |
| Zucchini | Mar 29 | Apr 26–May 3 | 158 | two-plantings: Plant Apr 26 and again by Jul 24; both mature before Oct 1. | Jul 24 |
| Onion | Jan 18 | Mar 15–Mar 29 | 221 | fits: 100 days to maturity, 221 available after Mar 15. | — |
| Spinach | — | Feb 15–Apr 5 | 263 | two-plantings: Plant Feb 15 and again by Sep 12; both mature before Nov 5. | Sep 12 |
| Kale | Feb 1 | Mar 15–Mar 29 | 235 | two-plantings: Plant Mar 15 and again by Aug 28; both mature before Nov 5. | Aug 28 |
| Broccoli | Feb 15 | Mar 15–Mar 29 | 221 | fits: 80 days to maturity, 221 available after Mar 15. | Jul 20 |
| Cabbage | Feb 15 | Mar 15–Mar 29 | 235 | fits: 70 days to maturity, 235 available after Mar 15. | Aug 13 |
| Radish | — | Feb 15–May 10 | 249 | two-plantings: Plant Feb 15 and again by Sep 13; both mature before Oct 22. | Sep 13 |
| Beets | — | Feb 15–May 10 | 249 | two-plantings: Plant Feb 15 and again by Aug 14; both mature before Oct 22. | Aug 14 |
| Potatoes | — | Mar 29–Apr 5 | 207 | fits: 90 days to maturity, 207 available after Mar 29. | — |
| Garlic | — | Oct 15 | 291 | overwinter: Plant Oct 15 to Nov 5; harvest the following summer. | Nov 5 |
| Strawberry | — | Mar 8–May 3 | 242 | perennial: A perennial: plant Mar 8; it fruits from the following year and keeps producing for several years. | — |
| Corn | Mar 15 | Apr 19–Apr 26 | 158 | fits: 75 days to maturity, 158 available after Apr 19. | Jun 27 |
| Pumpkin | Mar 29 | Apr 26–Apr 26 | 151 | fits: 100 days to maturity, 151 available after Apr 26. | Jun 2 |
| Cauliflower | Mar 1 | Apr 5–Apr 19 | 200 | fits: 75 days to maturity, 200 available after Apr 5. | Jul 25 |
| Swiss Chard | Feb 15 | Mar 29–Mar 29 | 207 | two-plantings: Plant Mar 29 and again by Aug 14; both mature before Oct 22. | Aug 14 |
| Arugula | — | Feb 15–May 10 | 263 | two-plantings: Plant Feb 15 and again by Sep 12; both mature before Nov 5. | Sep 12 |
| Brussel Sprouts | Feb 15 | Mar 15–Mar 29 | 235 | fits: 100 days to maturity, 235 available after Mar 15. | Jul 14 |
| Butternut Squash | Mar 29 | Apr 26–May 3 | 151 | fits: 100 days to maturity, 151 available after Apr 26. | Jun 2 |
| Eggplant | Feb 22 | Apr 26–May 3 | 144 | fits: 70 days to maturity, 144 available after Apr 26. | Jun 25 |
| Okra | Mar 15 | Apr 19–Apr 26 | 165 | two-plantings: Plant Apr 19 and again by Jul 24; both mature before Oct 1. | Jul 24 |
| Basil | Mar 8 | May 3–May 3 | 151 | two-plantings: Plant May 3 and again by Jul 19; both mature before Oct 1. | Jul 19 |
| Cilantro | — | Mar 15–Apr 5 | 221 | two-plantings: Plant Mar 15 and again by Aug 19; both mature before Oct 22. | Aug 19 |
| Parsley | Feb 1 | Apr 19–Apr 26 | 186 | fits: 70 days to maturity, 186 available after Apr 19. | Jul 30 |
| Celery | Feb 1 | Apr 19–May 3 | 186 | fits: 120 days to maturity, 186 available after Apr 19. | Jun 10 |
| Scallions | Feb 1 | Mar 15–Mar 29 | 235 | two-plantings: Plant Mar 15 and again by Aug 23; both mature before Nov 5. | Aug 23 |
| Turnip | — | Mar 15–Mar 29 | 235 | two-plantings: Plant Mar 15 and again by Sep 2; both mature before Nov 5. | Sep 2 |
| Kohlrabi | — | Mar 1–Mar 15 | 249 | two-plantings: Plant Mar 1 and again by Aug 28; both mature before Nov 5. | Aug 28 |
| Bok Choy | Mar 15 | Apr 5–Apr 12 | 200 | two-plantings: Plant Apr 5 and again by Aug 24; both mature before Oct 22. | Aug 24 |
| Collards | Feb 1 | Mar 15–Mar 29 | 235 | two-plantings: Plant Mar 15 and again by Aug 23; both mature before Nov 5. | Aug 23 |
| Cantaloupe | Mar 29 | Apr 26–May 3 | 144 | fits: 85 days to maturity, 144 available after Apr 26. | Jun 10 |
| Chives | Jan 18 | Apr 19–Apr 26 | 200 | fits: 90 days to maturity, 200 available after Apr 19. | — |
| Dill | — | Feb 15–May 10 | 249 | two-plantings: Plant Feb 15 and again by Aug 14; both mature before Oct 22. | Aug 14 |
| Oregano | Feb 1 | Apr 19–Apr 26 | 200 | fits: 80 days to maturity, 200 available after Apr 19. | — |
| Rosemary | Jan 18 | Apr 19–Apr 26 | 186 | fits: 80 days to maturity, 186 available after Apr 19. | — |
| Sage | Feb 15 | Apr 19–Apr 26 | 200 | fits: 75 days to maturity, 200 available after Apr 19. | — |
| Thyme | Feb 1 | Apr 19–Apr 26 | 200 | fits: 90 days to maturity, 200 available after Apr 19. | — |
| Calendula | Mar 1 | Mar 29–Apr 12 | 207 | two-plantings: Plant Mar 29 and again by Aug 19; both mature before Oct 22. | Aug 19 |
| Cosmos | Mar 15 | Apr 12–Apr 26 | 172 | two-plantings: Plant Apr 12 and again by Jul 19; both mature before Oct 1. | Jul 19 |
| Lavender | Jan 18 | Apr 12–Apr 26 | 207 | fits: 90 days to maturity, 207 available after Apr 12. | — |
| Marigolds | Mar 1 | Apr 12–Apr 19 | 172 | two-plantings: Plant Apr 12 and again by Jul 29; both mature before Oct 1. | Jul 29 |
| Melons | Mar 29 | Apr 26–May 3 | 144 | fits: 85 days to maturity, 144 available after Apr 26. | Jun 10 |
| Mint | — | Apr 12–Apr 26 | 207 | fits: 90 days to maturity, 207 available after Apr 12. | — |
| Nasturtiums | Mar 15 | Apr 12–Apr 19 | 172 | two-plantings: Plant Apr 12 and again by Jul 24; both mature before Oct 1. | Jul 24 |
| Pole Beans | — | Apr 19–May 3 | 165 | fits: 65 days to maturity, 165 available after Apr 19. | Jul 14 |
| Spaghetti Squash | Mar 29 | Apr 26–May 3 | 151 | fits: 90 days to maturity, 151 available after Apr 26. | Jun 12 |
| Sunflowers | — | Apr 12–Apr 26 | 172 | fits: 70 days to maturity, 172 available after Apr 12. | Jul 9 |
| Tomatillos | Feb 15 | Apr 19–Apr 26 | 151 | fits: 75 days to maturity, 151 available after Apr 19. | Jun 20 |
| Watermelon | Mar 29 | Apr 19–Apr 26 | 151 | fits: 80 days to maturity, 151 available after Apr 19. | Jun 15 |
| Yellow Squash | Mar 29 | Apr 26–May 3 | 158 | two-plantings: Plant Apr 26 and again by Jul 24; both mature before Oct 1. | Jul 24 |
| Zinnias | Mar 15 | Apr 12–Apr 26 | 172 | two-plantings: Plant Apr 12 and again by Jul 19; both mature before Oct 1. | Jul 19 |
Month by month in Lake Saint Louis
| Month | What to do |
|---|---|
| January | Start indoors: Chives (Jan 18), Lavender (Jan 18), Onion (Jan 18), Rosemary (Jan 18). |
| February | Start indoors: Celery (Feb 1), Collards (Feb 1), Kale (Feb 1), Oregano (Feb 1), Parsley (Feb 1), Scallions (Feb 1), +9 more. Direct sow from: Arugula (Feb 15), Beets (Feb 15), Dill (Feb 15), Peas (Feb 15), Radish (Feb 15), Spinach (Feb 15). |
| March | Start indoors: Calendula (Mar 1), Cauliflower (Mar 1), Marigolds (Mar 1), Pepper (Mar 1), Basil (Mar 8), Tomato (Mar 8), +15 more. Direct sow from: Kohlrabi (Mar 1), Cilantro (Mar 15), Turnip (Mar 15), Carrots (Mar 22), Potatoes (Mar 29). Transplant from: Broccoli (Mar 15), Brussel Sprouts (Mar 15), Cabbage (Mar 15), Collards (Mar 15), Kale (Mar 15), Lettuce (Mar 15), +4 more. Plant: Strawberry (Mar 8). |
| April | Direct sow from: Sunflowers (Apr 12), Beans (Apr 19), Pole Beans (Apr 19). Transplant from: Bok Choy (Apr 5), Cauliflower (Apr 5), Cosmos (Apr 12), Lavender (Apr 12), Marigolds (Apr 12), Mint (Apr 12), +24 more. Last frost around April 12. |
| May | Transplant from: Basil (May 3). |
| June | Last sowing dates: Butternut Squash (Jun 2), Pumpkin (Jun 2), Cantaloupe (Jun 10), Celery (Jun 10), Melons (Jun 10), Spaghetti Squash (Jun 12), +6 more. |
| July | Last sowing dates: Sunflowers (Jul 9), Brussel Sprouts (Jul 14), Pole Beans (Jul 14), Basil (Jul 19), Cosmos (Jul 19), Cucumber (Jul 19), +10 more. |
| August | Last sowing dates: Peas (Aug 4), Cabbage (Aug 13), Carrots (Aug 13), Beets (Aug 14), Dill (Aug 14), Swiss Chard (Aug 14), +8 more. |
| September | Last sowing dates: Turnip (Sep 2), Arugula (Sep 12), Spinach (Sep 12), Radish (Sep 13). |
| October | Direct sow from: Garlic (Oct 15). First frost around October 15. |
| November | Last sowing dates: Garlic (Nov 5). |
| 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 Lake Saint Louis, MO (ZIP 63367)?
The median last spring frost date for Lake Saint Louis, MO (ZIP code 63367) is around April 12. 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 29; one in ten it runs past April 27.
What is the first fall frost date in Lake Saint Louis, MO?
The median first fall frost date for Lake Saint Louis, MO is around October 15. 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 29 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Lake Saint Louis, MO?
The frost-free growing season in Lake Saint Louis is about 186 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 Lake Saint Louis (186 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 Lake Saint Louis, MO?
Lake Saint Louis, 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 Lake Saint Louis, MO?
Start tomatoes indoors Mar 8 and plant out Apr 26 in Lake Saint Louis. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Lake Saint Louis?
Two: plant Mar 15 and again by Aug 24; both mature before Oct 22.
When do I plant garlic in Lake Saint Louis?
Oct 15 to Nov 5; it overwinters and is ready the following summer.
Can I get two tomato crops in Lake Saint Louis?
Yes: plant out Apr 26 for a summer crop, and set out a second round of transplants by Jun 15 for a fall crop.
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