St. Joseph, Missouri planting calendar and frost dates
St. Joseph is in USDA hardiness zone 6a. The last spring frost typically comes around April 19 and the first fall frost around October 17, giving about 180 frost-free days a year.
- Hardiness zone
- Zone 6a
- Typical last frost
- April 19
- Typical first frost
- October 17
- Frost-free season
- 180 days
Frost dates in St. Joseph
Last spring frost
- April 5Risky: frost later than this in 9 years out of 10
- April 19Typical: a later frost in half of years
- May 3Safe: a later frost only 1 year in 10
First fall frost
- September 30Risky: frost earlier than this 1 year in 10
- October 17Typical: an earlier frost in half of years
- October 30Late: frost before this in 9 years out of 10
The growing season between the typical last and first frosts is about 180 days. Frost here means a low of 32°F at the weather station. A hard freeze (28°F), which damages most hardy crops too, typically ends around April 9 and returns around October 26.
NOAA U.S. Climate Normals 1991-2020 for St Joseph Rosecrans Airport, 6.5 miles W of the city center and 193 feet lower. Low-lying and rural spots often frost later in spring and earlier in fall than airports and city centers.
What to plant each month in St. Joseph
January
Start indoors: collard greens, leeks, onions, petunias, ranunculus
February
Start indoors: black-eyed susans, broccoli, cabbages, cauliflower, celery, chives, collard greens, ginger, kale, leeks, lettuce, marigolds, onions, oregano, parsley, peppers, petunias, ranunculus, rosemary, sage, snapdragons
March
Start indoors: basil, black-eyed susans, cabbages, cantaloupes, cauliflower, celery, chives, cilantro, collard greens, eggplants, ginger, lettuce, marigolds, nasturtiums, peppers, ranunculus, sage, snapdragons, spinach, swiss chard, tomatoes, watermelons
Plant or sow outdoors: beets, black-eyed susans, blackberries, blueberries, broccoli, cabbages, carrots, cauliflower, chives, cilantro, collard greens, figs, garlic, gladioli, grapes, grass seed, hollyhocks, kale, leeks, lettuce, onions, parsley, peas, poppies, radishes, ranunculus, raspberries, rhubarb, roses, spinach, strawberries, swiss chard, turnips, wildflowers
April
Start indoors: cantaloupes, cosmos, cucumbers, okra, pumpkins, ranunculus, watermelons, winter squash, zucchini
Plant or sow outdoors: asparagus, beets, black-eyed susans, blackberries, broccoli, cabbages, carrots, cauliflower, chives, cilantro, dahlias, dill, figs, garden mums, ginger, gladioli, grapes, green onions, kentucky bluegrass, lavenders, leeks, lettuce, lilies, marigolds, mints, nasturtiums, onions, oregano, parsley, perennial ryegrass, petunias, potatoes, radishes, ranunculus, rosemary, roses, sage, snapdragons, spinach, sunflowers, sweet corn, sweet peas, swiss chard, tall fescue, thyme, turnips
May
Start indoors: zinnias
Plant or sow outdoors: asparagus, basil, bermudagrass, cantaloupes, celery, centipedegrass, cosmos, cucumbers, eggplants, garden mums, ginger, grapes, green beans, green onions, kentucky bluegrass, lavenders, lilies, marigolds, mints, nasturtiums, okra, oregano, parsley, peanuts, peppers, perennial ryegrass, petunias, pumpkins, rosemary, sage, st. augustinegrass, sunflowers, sweet corn, sweet peas, sweet potatoes, tall fescue, thyme, tomatoes, watermelons, winter squash, zinnias, zoysiagrass, zucchini
June
Plant or sow outdoors: bermudagrass, centipedegrass, green onions, okra, st. augustinegrass, zinnias, zoysiagrass
July
Plant for fall: bearded irises, brussels sprouts, carrots, collard greens, lettuce, peas, snapdragons, swiss chard
August
Plant for fall: azaleas, bearded irises, beets, broccoli, cabbages, carrots, cauliflower, clematis, collard greens, coneflowers, daylilies, hostas, hydrangeas, kale, lettuce, peas, radishes, roses, saffron, snapdragons, spinach, swiss chard, turnips
September
Plant for fall: azaleas, bearded irises, cabbages, cauliflower, clematis, coneflowers, crocuses, daffodils, daylilies, grass seed, hostas, hyacinths, hydrangeas, kale, kentucky bluegrass, lilies, ornamental alliums, peonies, perennial ryegrass, radishes, roses, saffron, spinach, tall fescue, tulips
October
Plant for fall: crocuses, daffodils, garlic, hyacinths, lilies, ornamental alliums, peonies, tulips
December
Start indoors: onions
Frost dates and zones by ZIP code in St. Joseph
All 6 of St. Joseph's main ZIP codes take their frost dates from St Joseph Rosecrans Airport, so the dates on this page apply across the city. Every one of them is in zone 6a.
| ZIP code | Zone | Weather station | Typical last frost | Typical first frost |
|---|---|---|---|---|
| 64501 | 6a | St Joseph Rosecrans Airport, 4.2 mi W | Apr 19 | Oct 17 |
| 64503 | 6a | St Joseph Rosecrans Airport, 4.5 mi WNW | Apr 19 | Oct 17 |
| 64504 | 6a | St Joseph Rosecrans Airport, 5.8 mi N | Apr 19 | Oct 17 |
| 64505 | 6a | St Joseph Rosecrans Airport, 7.3 mi SW | Apr 19 | Oct 17 |
| 64506 | 6a | St Joseph Rosecrans Airport, 6.5 mi W | Apr 19 | Oct 17 |
| 64507 | 6a | St Joseph Rosecrans Airport, 10 mi WNW | Apr 19 | Oct 17 |
Planting dates for popular crops in St. Joseph
| Plant | Start indoors | Plant or sow outdoors | Fall planting |
|---|---|---|---|
| Tomatoes | Mar 9 to 23 | May 4 to 18 | — |
| Strawberries | — | Mar 8 to 22 | — |
| Lettuce | Feb 22 to Mar 8 | Apr 12 to 26 | Jul 18 to Aug 22 |
| Cilantro | Mar 8 to 22 | Apr 19 to 26 | — |
| Basil | Mar 16 to 30 | May 4 to 11 | — |
| Potatoes | — | Apr 4 to 11 | — |
| Garlic | — | Mar 8 to 22 | Oct 17 to 31 |
| Onions | Dec 28 to Feb 8 | Mar 22 to Apr 5 | — |
| Cucumbers | Apr 6 to 20 | May 4 to 18 | — |
| Pumpkins | Apr 6 to 20 | May 4 to 18 | — |
| Peppers | Feb 16 to Mar 16 | May 4 to 18 | — |
| Carrots | — | Mar 29 to Apr 19 | Jul 25 to Aug 15 |
| Sweet Potatoes | — | May 17 to 24 | — |
| Watermelons | Mar 30 to Apr 13 | May 4 to 18 | — |
| Sweet Corn | — | Apr 19 to May 3 | — |
| Green Beans | — | May 4 to 18 | — |
| Zucchini | Apr 6 to 20 | May 4 to 18 | — |
| Broccoli | Feb 1 to 22 | Mar 22 to Apr 5 | Aug 1 to 29 |
| Peas | — | Mar 8 to 22 | Jul 25 to Aug 8 |
| Spinach | Mar 8 to 15 | Apr 12 to 26 | Aug 8 to Sep 12 |
| Sunflowers | — | Apr 19 to May 10 | — |
| Zinnias | May 2 to 9 | May 30 to Jun 13 | — |
| Tulips | — | — | Sep 5 to Oct 31 |
| Daffodils | — | — | Sep 5 to Oct 17 |
| Grass Seed | — | Mar 8 to 22 | Sep 5 to 19 |
Nearby cities
- Kansas City, KS zone 6b, last frost Apr 4
- Kansas City, MO zone 6b, last frost Apr 4
- Shawnee, KS zone 6b, last frost Apr 16
- Independence, MO zone 6b, last frost Apr 10
- Lenexa, KS zone 6b, last frost Apr 8
- Blue Springs, MO zone 6b, last frost Apr 10
Planting in MissouriAbout zone 6aPrintable calendar for St. Joseph
Questions
When is the last frost in St. Joseph?
Around April 19 in a typical year, based on NOAA's 1991-2020 records for St Joseph Rosecrans Airport. There is still a 1 in 10 chance of frost after May 3.
What planting zone is St. Joseph in?
USDA hardiness zone 6a (2023 map). The zone tells you which perennials survive the winter; planting dates depend on frost dates instead.
When should I plant tomatoes in St. Joseph?
Start seeds indoors March 9 to 23 and set plants out May 4 to 18.
When is the first frost in St. Joseph?
Around October 17 in a typical year, and before September 30 about 1 year in 10.