Frost Dates & Planting Calendar for Florissant, MO
Plan your garden around Florissant, MO's typical frost-free growing season, using NOAA climate normals and a 42-crop planting calendar built for this location.
Last Spring Frost
April 2
Safe Apr 17
Typical Apr 2
Risky Mar 17
First Fall Frost
November 4
Safe Oct 23
Typical Nov 4
Risky Nov 18
Growing Season
215 days
Typical last frost to typical first frost.
USDA Hardiness Zone
Zone 7a
Mild winters and a long growing season, room for both cool- and warm-season crops.
Data: NOAA station ST LOUIS LAMBERT INTL AP, MO US, 6 km away.
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days until the typical last spring frost
Monthly Temperatures
Avg. high
Avg. temp
Avg. low
Planting Calendar
| Crop | Start indoors | Direct sow | Transplant | Fall planting | Maturity | Notes |
|---|---|---|---|---|---|---|
| Tomato | Feb 5 – Feb 19 | — | Apr 9 – Apr 16 | — | 60–85 days | Start indoors 6-8 weeks before last frost; transplant out 1-2 weeks after last frost once soil has warmed. |
| Pepper | Jan 22 – Feb 5 | — | Apr 9 – Apr 23 | — | 60–90 days | Slow to germinate; start indoors 8-10 weeks before last frost. Transplant only once nights stay above 55F, 1-3 weeks after last frost. |
| Eggplant | Jan 22 – Feb 5 | — | Apr 16 – Apr 23 | — | 65–85 days | Warm-season crop, similar timing to pepper; needs consistently warm soil (65F+) to transplant. |
| Cucumber | Mar 5 – Mar 12 | Apr 9 – Apr 16 | Apr 9 – Apr 16 | — | 50–65 days | Can be started indoors 3-4 weeks before transplanting, or direct-sown 1-2 weeks after last frost once soil is warm. |
| Zucchini | Mar 12 – Mar 19 | Apr 9 – Apr 23 | Apr 9 – Apr 16 | — | 45–55 days | Fast-growing squash; direct sow 1-3 weeks after last frost, or start indoors 2-3 weeks early for a head start. |
| Winter Squash | Mar 5 – Mar 12 | Apr 9 – Apr 23 | Apr 9 – Apr 16 | — | 80–110 days | Long season; direct sow after soil warms, or start indoors 3-4 weeks before last frost in short-season climates. |
| Pumpkin | — | Apr 9 – Apr 23 | — | — | 90–120 days | Direct sow 1-3 weeks after last frost; back-time from your first fall frost so the 90-120 day maturity window lands before it. |
| Watermelon | Mar 5 – Mar 12 | — | Apr 16 – Apr 23 | — | 70–90 days | Needs warm soil (65F+); start indoors 3-4 weeks before last frost, transplant 2-3 weeks after last frost. |
| Cantaloupe | Mar 5 – Mar 12 | — | Apr 16 – Apr 23 | — | 70–90 days | Same warm-soil requirements as watermelon; avoid disturbing roots when transplanting. |
| Corn | — | Apr 2 – Apr 16 | — | — | 60–100 days | Direct sow at last frost to 2 weeks after, once soil reaches 60F; does not transplant well. Succession sow every 2 weeks. |
| Green Bean | — | Apr 2 – Apr 16 | — | — | 50–65 days | Direct sow at last frost to 2 weeks after, once soil has warmed; frost-tender, do not rush. |
| Pea | — | Feb 19 – Mar 5 | — | — | 55–70 days | Cold-hardy; direct sow 4-6 weeks before last frost as soon as soil can be worked. |
| Lettuce | — | Mar 5 – Mar 19 | — | Sep 9 – Sep 23 | 45–60 days | Cold-hardy; direct sow 2-4 weeks before last frost. Also transplantable from indoor starts. |
| Spinach | — | Feb 19 – Mar 5 | — | Sep 9 – Sep 23 | 40–50 days | Very cold-hardy; direct sow 4-6 weeks before last frost as soon as soil can be worked. |
| Kale | — | Mar 5 – Mar 19 | — | Aug 26 – Sep 9 | 50–65 days | Cold-hardy; direct sow 2-4 weeks before last frost or start indoors for earlier transplants. |
| Arugula | — | Mar 5 – Mar 19 | — | Sep 23 – Sep 30 | 30–40 days | Fast-growing, cold-tolerant green; direct sow 2-4 weeks before last frost, succession sow every 2-3 weeks. |
| Swiss Chard | — | Mar 12 – Mar 26 | — | — | 50–60 days | Fairly cold-hardy; direct sow 1-3 weeks before last frost. Tolerates light frost in fall too. |
| Broccoli | Feb 12 – Feb 26 | — | Mar 12 – Mar 19 | Sep 2 – Sep 9 | 55–80 days | Start indoors 5-7 weeks before last frost; transplant out 2-3 weeks before last frost (hardens off to light frost). |
| Cauliflower | Feb 12 – Feb 26 | — | Mar 19 – Mar 26 | Aug 26 – Sep 2 | 55–85 days | Fussier than broccoli about temperature swings; start indoors 5-7 weeks before last frost, transplant 1-2 weeks before last frost. |
| Cabbage | Feb 12 – Feb 26 | — | Mar 5 – Mar 19 | Aug 26 – Sep 9 | 60–100 days | Cold-hardy; start indoors 5-7 weeks before last frost, transplant 2-4 weeks before last frost. |
| Brussels Sprouts | Feb 12 – Feb 26 | — | Mar 12 – Mar 26 | — | 90–110 days | Long-season crop best timed to mature after a light fall frost for sweetest flavor; start indoors 5-7 weeks before last frost. |
| Carrot | — | Mar 5 – Mar 19 | — | Aug 12 – Aug 26 | 60–80 days | Direct sow only (does not transplant); sow 2-4 weeks before last frost, as soon as soil can be worked. |
| Beet | — | Mar 5 – Mar 19 | — | Aug 26 – Sep 9 | 50–65 days | Direct sow 2-4 weeks before last frost; tolerates light frost. |
| Radish | — | Feb 26 – Mar 12 | — | Sep 23 – Oct 7 | 22–30 days | Very fast and cold-hardy; direct sow 3-5 weeks before last frost, as soon as soil can be worked. |
| Turnip | — | Mar 5 – Mar 19 | — | Aug 26 – Sep 9 | 40–60 days | Cold-hardy; direct sow 2-4 weeks before last frost. |
| Onion | Jan 22 – Feb 5 | — | Mar 5 – Mar 19 | — | 90–120 days | Start seeds indoors 8-10 weeks before last frost (or use sets/transplants); set out 2-4 weeks before last frost, very cold-tolerant as seedlings. |
| Garlic | — | — | — | Oct 7 – Oct 21 | 240–270 days | Fall-planted crop only; not planted in spring in most climates. |
| Potato | — | Mar 5 – Mar 19 | — | — | 70–120 days | Plant seed potatoes 2-4 weeks before last frost, as soon as soil can be worked and is above 45F; light frost on emerging foliage is usually tolerated. |
| Sweet Potato | — | — | Apr 16 – Apr 30 | — | 90–120 days | Set out slips 2-4 weeks after last frost once soil is thoroughly warm (65F+); very frost/cold sensitive. |
| Asparagus | — | — | Mar 5 – Mar 19 | — | 730–1095 days | Perennial; plant crowns 2-4 weeks before last frost as soon as soil can be worked. Takes 2-3 years to full production. |
| Crop | Start indoors | Direct sow | Transplant | Fall planting | Maturity | Notes |
|---|---|---|---|---|---|---|
| Basil | Feb 19 – Feb 26 | — | Apr 9 – Apr 16 | — | 50–70 days | Very frost/cold sensitive; start indoors 5-6 weeks before last frost, transplant only after all danger of frost (1-2 weeks after) and nights stay warm. |
| Cilantro | — | Mar 12 – Mar 26 | — | Sep 9 – Sep 23 | 45–70 days | Cool-season, bolts in heat; direct sow 1-3 weeks before last frost, succession sow through spring. |
| Parsley | Feb 5 – Feb 19 | — | Mar 19 – Mar 26 | — | 70–90 days | Slow to germinate; start indoors 6-8 weeks before last frost, transplant 1-2 weeks before last frost (biennial, cold-tolerant). |
| Dill | — | Mar 12 – Mar 26 | — | — | 40–60 days | Taprooted, does not transplant well; direct sow 1-3 weeks before last frost, succession sow through summer. |
| Oregano | Feb 5 – Feb 19 | — | Apr 2 – Apr 9 | — | 80–90 days | Perennial herb; start indoors 6-8 weeks before last frost, transplant around/just after last frost date. |
| Thyme | Feb 5 – Feb 19 | — | Apr 2 – Apr 9 | — | 85–95 days | Perennial herb, slow from seed; start indoors 6-8 weeks before last frost, transplant around/after last frost. |
| Crop | Start indoors | Direct sow | Transplant | Fall planting | Maturity | Notes |
|---|---|---|---|---|---|---|
| Sunflower | — | Apr 9 – Apr 23 | — | — | 70–100 days | Direct sow 1-3 weeks after last frost once soil has warmed; taprooted, resents transplanting. |
| Zinnia | Mar 5 – Mar 12 | Apr 9 – Apr 23 | Apr 9 – Apr 16 | — | 60–70 days | Frost-tender; direct sow 1-3 weeks after last frost, or start indoors 3-4 weeks early for earlier blooms. |
| Marigold | Feb 19 – Mar 5 | — | Apr 9 – Apr 16 | — | 45–60 days | Frost-tender; start indoors 4-6 weeks before last frost, transplant after all frost danger has passed. |
| Cosmos | Mar 5 – Mar 12 | Apr 9 – Apr 23 | Apr 9 – Apr 16 | — | 60–90 days | Easy from direct seed 1-3 weeks after last frost; can also start indoors 3-4 weeks early. |
| Nasturtium | — | Apr 9 – Apr 23 | — | — | 50–65 days | Frost-tender, resents root disturbance; direct sow 1-3 weeks after last frost once soil has warmed. |
| Dahlia | — | — | Apr 9 – Apr 23 | — | 90–120 days | Plant tubers 1-3 weeks after last frost once soil is warm (60F+); very frost-sensitive. |
Date ranges are estimates based on university extension guidelines and this city's NOAA frost normals — not a guarantee. Scroll to see all columns on narrow screens.
Frequently Asked Questions
When is the last frost in Florissant, MO?
Based on 1991–2020 NOAA climate normals for the ST LOUIS LAMBERT INTL AP, MO US station, the last spring frost in Florissant typically falls around April 2. A cautious gardener might wait until April 17 (only a 10% chance of a later frost), while March 17 marks an earlier, higher-risk planting date.
When is the first frost in Florissant, MO in fall?
The first fall frost in Florissant typically arrives around November 4. To stay safe, assume frost could start as early as October 23; in milder years it can hold off until November 18.
How long is the growing season in Florissant, MO?
Florissant's average frost-free growing season is about 215 days, running from the typical last spring frost (April 2) to the typical first fall frost (November 4).
What USDA hardiness zone is Florissant, MO in?
Florissant, MO is in USDA plant hardiness zone 7a, per the USDA's 2023 Plant Hardiness Zone Map. Mild winters and a long growing season, room for both cool- and warm-season crops.