When to Plant Eggplant in St. George, UT
Published: April 24, 2026
Eggplant Planting Dates for St. George, UT
| Start seeds indoors | January 18–25 |
| Last frost (average) | March 22 |
| Transplant outdoors | April 12–22 |
| Minimum soil temperature | 60°F |
| Expect first harvest | June 16 – July 1 |
| First fall frost (average) | November 10 |
⚠ Start eggplant indoors 8–10 weeks before last frost — same timing as peppers. Transplant 2–3 weeks after last frost when soil is above 60°F. Needs heat and full sun. Does not tolerate cold — protect from temps below 50°F.
Best Eggplant Varieties for St. George, UT
Consult a St. George-area nursery or your state extension office for eggplant varieties proven in Zone 6b.
Growing Eggplant in St. George
St. George sits in Zone 6b, with an average last frost of March 22 and first fall frost around November 10 — giving a 233-day frost-free growing season. Warm-season crops like eggplant need soil at 60°F or above before transplanting; St. George's frost calendar puts that window clearly in the late-spring to early-fall range.
St. George's moderate climate supports eggplant on the standard transplant calendar with minimal special accommodation. Succession planting — sowing fresh seeds or setting new transplants every 2–3 weeks through spring — stretches the harvest window and gives you a backup crop if pests hit the first planting.
St. George's caliche soil is rock-hard below the surface — raised beds filled with quality potting mix are the most practical approach for eggplant. Breaking through caliche for in-ground planting requires significant soil amendment, gypsum application, and deep tilling over several seasons. Water at 1 inches per week delivered through drip irrigation for best results in a raised-bed system.
Eggplant Calendar for St. George
| Month | Task |
|---|---|
| January | Start seeds indoors under grow lights |
| March | Last frost — harden off seedlings outdoors |
| April | Transplant outdoors into warm soil |
| June | Expect first harvest window to open |
| November | First fall frost — harvest remaining, end of outdoor season |
Eggplant Tips for St. George Gardeners
- •Use a heat mat during germination — eggplant seeds need 24–27°C soil to sprout reliably.
- •Protect transplants from cold spring nights — temperatures below 10°C halt growth for weeks.
- •Succession plant eggplant in St. George every 2–3 weeks through spring to extend the harvest window into summer.
Common Eggplant Pests in St. George
- •Flea Beetle — peaks July in Zone 6b (active May–September); tiny black beetles that riddle leaves with holes; row covers protect seedlings.
- •Colorado Potato Beetle — peaks July in Zone 6b (active May–September); monitor closely during peak season and treat early.
- •Spider Mite — peaks July in Zone 6b (active May–September); fine webbing and stippled leaves; increase humidity and spray plants with water.
Check plants every 2–3 days during peak season — early intervention prevents most infestations from becoming serious.
What to Plant with Eggplant in St. George
In St. George's moderate climate, Pepper and Bean are the most beneficial plants to grow alongside eggplant. Pepper improves nearby plant health and pest resistance. Keep eggplant away from Fennel — it releases root chemicals that inhibit growth of most neighbors.
Frequently Asked Questions
When should I plant eggplant in St. George, UT?
In St. George (Zone 6b), start eggplant seeds indoors around January 18–25 and transplant outdoors around April 12–22. The city's average last frost of March 22 is the anchor date — count 9 weeks back for seed starting and 3 weeks forward for transplanting.
What zone is St. George, UT for eggplant growing?
St. George is USDA Zone 6b. For eggplant, this means a frost-free growing season of roughly 33 weeks running from March 22 to November 10. This is a comfortable window for warm-season crops like eggplant — standard varieties work well.
When is eggplant harvest season in St. George?
Expect the first eggplant harvest in St. George around June 16, with harvest continuing through July 1. This is based on 65–80 days from transplant or direct sow.
How long does it take to grow eggplant in St. George, UT?
From transplant or direct sow to first harvest, eggplant takes 65–80 days in St. George's climate. Based on a typical planting date of April 12–22, expect your first harvest around June 16. St. George's Zone 6b transition-zone climate produces maturity times right in the middle of the stated range.
What soil does eggplant need in St. George?
St. George's caliche subsoil is effectively rock — traditional in-ground planting of eggplant produces poor results. Build a raised bed with 12–18 inches of quality potting mix or Mel's Mix for reliable production. Break through caliche only for deep-rooted crops, and expect to add compost each year to offset the alkalinity.