St. George, Utah planting calendar and frost dates
St. George is in USDA hardiness zone 8b. The last spring frost typically comes around March 14 and the first fall frost around November 10, giving about 239 frost-free days a year.
- Typical last frost
- March 14
- Typical first frost
- November 10
- Frost-free season
- 239 days
Frost dates in St. George
Last spring frost
- February 27Risky: frost later than this in 9 years out of 10
- March 14Typical: a later frost in half of years
- April 6Safe: a later frost only 1 year in 10
First fall frost
- October 27Risky: frost earlier than this 1 year in 10
- November 10Typical: an earlier frost in half of years
- November 22Late: frost before this in 9 years out of 10
The growing season between the typical last and first frosts is about 239 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 February 27 and returns around November 20.
NOAA U.S. Climate Normals 1991-2020 for St George, 1.6 miles NW of the city center and 161 feet higher. 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. George
January
Start indoors: black-eyed susans, broccoli, cabbages, cauliflower, chives, cilantro, collard greens, ginger, kale, leeks, lettuce, marigolds, nasturtiums, onions, oregano, parsley, peppers, petunias, ranunculus, rosemary, sage, snapdragons, spinach, swiss chard
Plant or sow outdoors: black-eyed susans, blueberries, garlic, grapes, grass seed, hollyhocks, onions, peas, poppies, raspberries, rhubarb, strawberries, turnips, wildflowers
February
Start indoors: basil, celery, cilantro, eggplants, ginger, marigolds, nasturtiums, peppers, ranunculus, spinach, swiss chard, tomatoes
Plant or sow outdoors: beets, black-eyed susans, blackberries, blueberries, broccoli, cabbages, carrots, cauliflower, chives, cilantro, collard greens, dahlias, dill, figs, garlic, gladioli, grapes, grass seed, hollyhocks, kale, leeks, lettuce, onions, parsley, peas, poppies, radishes, ranunculus, raspberries, rhubarb, roses, snapdragons, spinach, strawberries, swiss chard, turnips, wildflowers
March
Start indoors: basil, cantaloupes, cosmos, cucumbers, okra, pumpkins, tomatoes, watermelons, winter squash, zucchini
Plant or sow outdoors: asparagus, beets, carrots, cauliflower, chives, cilantro, dahlias, dill, figs, garden mums, ginger, gladioli, grapes, green onions, kentucky bluegrass, lavenders, leeks, lettuce, lilies, marigolds, mints, nasturtiums, oregano, parsley, perennial ryegrass, petunias, potatoes, ranunculus, rosemary, roses, sage, snapdragons, spinach, sunflowers, sweet corn, sweet peas, swiss chard, tall fescue, thyme
April
Start indoors: cosmos, cucumbers, okra, pumpkins, winter squash, zinnias, zucchini
Plant or sow outdoors: asparagus, basil, cantaloupes, cucumbers, eggplants, garden mums, ginger, green beans, green onions, kentucky bluegrass, peppers, perennial ryegrass, pumpkins, st. augustinegrass, sunflowers, sweet peas, tall fescue, tomatoes, watermelons, winter squash, zucchini
May
Plant or sow outdoors: bermudagrass, celery, centipedegrass, cosmos, green onions, okra, peanuts, st. augustinegrass, sweet potatoes, zinnias, zoysiagrass
June
Plant or sow outdoors: bermudagrass, centipedegrass, zoysiagrass
July
August
Plant for fall: bearded irises, broccoli, brussels sprouts, carrots, collard greens, cucumbers, green beans, lettuce, peas, peppers, snapdragons, sweet corn, swiss chard, tomatoes, zucchini
September
Plant for fall: azaleas, bearded irises, beets, broccoli, cabbages, carrots, cauliflower, clematis, collard greens, coneflowers, crocuses, daffodils, daylilies, grass seed, hostas, hydrangeas, kale, kentucky bluegrass, lettuce, lilies, ornamental alliums, peas, peonies, perennial ryegrass, radishes, roses, saffron, snapdragons, spinach, swiss chard, tall fescue, tulips, turnips, zucchini
October
Plant for fall: cabbages, cauliflower, crocuses, daffodils, daylilies, grass seed, hostas, hyacinths, kale, kentucky bluegrass, lilies, ornamental alliums, peonies, perennial ryegrass, radishes, saffron, spinach, tall fescue, tulips
November
Start indoors: onions
Plant for fall: crocuses, daffodils, garlic, hyacinths, lilies, ornamental alliums, peonies, tulips
December
Start indoors: broccoli, cauliflower, collard greens, kale, leeks, onions, petunias, ranunculus
Frost dates and zones by ZIP code in St. George
All 2 of St. George's main ZIP codes take their frost dates from St George, so the dates on this page apply across the city. Every one of them is in zone 8b.
Planting dates for popular crops in St. George
| Plant | Start indoors | Plant or sow outdoors | Fall planting |
|---|---|---|---|
| Tomatoes | Feb 19 to Mar 5 | Apr 16 to 30 | Jul 28 to Aug 4 |
| Strawberries | — | Jan 31 to Feb 14 | — |
| Lettuce | Jan 17 to 31 | Mar 7 to 21 | Aug 11 to Sep 15 |
| Cilantro | Jan 31 to Feb 14 | Mar 14 to 21 | — |
| Basil | Feb 26 to Mar 12 | Apr 16 to 23 | — |
| Potatoes | — | Mar 3 to 10 | Jul 21 to 28 |
| Garlic | — | Jan 31 to Feb 14 | Nov 10 to 24 |
| Onions | Nov 22 to Jan 3 | Feb 14 to 28 | — |
| Cucumbers | Mar 19 to Apr 2 | Apr 16 to 30 | Aug 11 to 25 |
| Pumpkins | Mar 19 to Apr 2 | Apr 16 to 30 | — |
| Peppers | Jan 29 to Feb 26 | Apr 16 to 30 | Jul 21 to Aug 18 |
| Carrots | — | Feb 21 to Mar 14 | Aug 18 to Sep 8 |
| Sweet Potatoes | — | May 2 to 9 | — |
| Watermelons | Mar 12 to 26 | Apr 16 to 30 | — |
| Sweet Corn | — | Mar 14 to 28 | Aug 4 to 18 |
| Green Beans | — | Apr 16 to 30 | Aug 18 to 25 |
| Zucchini | Mar 19 to Apr 2 | Apr 16 to 30 | Aug 18 to Sep 1 |
| Broccoli | Dec 27 to Jan 17 | Feb 14 to 28 | Aug 25 to Sep 22 |
| Peas | — | Jan 31 to Feb 14 | Aug 18 to Sep 1 |
| Spinach | Jan 31 to Feb 7 | Mar 7 to 21 | Sep 1 to Oct 6 |
| Sunflowers | — | Mar 14 to Apr 4 | — |
| Zinnias | Apr 17 to 24 | May 15 to 29 | — |
| Tulips | — | — | Sep 29 to Nov 24 |
| Daffodils | — | — | Sep 29 to Nov 10 |
| Grass Seed | — | Jan 31 to Feb 14 | Sep 29 to Oct 13 |
Nearby cities
- North Las Vegas, NV zone 9a, last frost Jan 20
- Henderson, NV zone 9b, last frost Jan 20
- Las Vegas, NV zone 8b, last frost Jan 20
- Flagstaff, AZ zone 6b, last frost Jun 4
- Lake Havasu City, AZ zone 10a, last frost Feb 18
- Prescott Valley, AZ zone 7b, last frost Apr 20
Planting in UtahAbout zone 8bPrintable calendar for St. George
Questions
When is the last frost in St. George?
Around March 14 in a typical year, based on NOAA's 1991-2020 records for St George. There is still a 1 in 10 chance of frost after April 6.
What planting zone is St. George in?
USDA hardiness zone 8b (2023 map), with parts of the city in zone 8a. The zone tells you which perennials survive the winter; planting dates depend on frost dates instead.
When should I plant tomatoes in St. George?
Start seeds indoors February 19 to March 5 and set plants out April 16 to 30.
When is the first frost in St. George?
Around November 10 in a typical year, and before October 27 about 1 year in 10.