When to Plant Turnips in St. George, UT
Published: April 24, 2026
Turnip Planting Dates for St. George, UT
| Start seeds indoors | Year-round |
| Last frost (average) | March 22 |
| Direct sow outdoors | March 1–11 |
| Minimum soil temperature | 40°F |
| Expect first harvest | April 5 – April 30 |
| Fall crop planting | September 15–25 |
| Fall crop harvest | October 20 |
| First fall frost (average) | November 10 |
⚠ Direct sow turnips 2–4 weeks before last frost for spring crop. Best planted in late summer (6–8 weeks before first fall frost) for fall harvest — frost sweetens the roots. Fast-growing: some varieties ready in just 35 days.
Best Turnip Varieties for St. George, UT
Consult a St. George-area nursery or your state extension office for turnip varieties proven in Zone 6b.
Growing Turnips 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. Cool-season crops like turnip benefit from St. George's cooler spring and fall windows, when temperatures stay in the 55–75°F sweet spot that produces the best flavor and least bolting.
St. George's moderate climate supports turnip 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 turnip. 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.
Turnip Calendar for St. George
| Month | Task |
|---|---|
| Year | Start seeds indoors under grow lights |
| March | Direct sow seeds into warm soil |
| April | Expect first harvest window to open |
| September | Start fall crop — transplants or direct sow |
| November | First fall frost — harvest remaining, end of outdoor season |
Turnip Tips for St. George Gardeners
- •Thin seedlings to 4-inch spacing when plants are 3 inches tall — crowded turnips produce small woody roots.
- •Both roots AND greens are edible — harvest baby turnip greens 4 weeks after sowing, roots 5–9 weeks.
- •Succession plant turnip in St. George every 2–3 weeks through spring to extend the harvest window into summer.
Common Turnip 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.
- •Aphid — peaks July in Zone 6b (active May–September); monitor closely during peak season and treat early.
- •Cabbage Root Maggot — peaks July in Zone 6b (active May–September); monitor closely during peak season and treat early.
Check plants every 2–3 days during peak season — early intervention prevents most infestations from becoming serious.
What to Plant with Turnips in St. George
In St. George's moderate climate, Pea and Mint are the most beneficial plants to grow alongside turnip. Pea improves nearby plant health and pest resistance. Keep turnip away from Potato — it competes for nutrients and shares blight diseases.
Frequently Asked Questions
When should I plant turnip in St. George, UT?
In St. George (Zone 6b), direct sow turnip around March 1–11. Soil must be at 40°F or warmer at 2-inch depth before sowing — cold soil rots the seeds.
What zone is St. George, UT for turnip growing?
St. George is USDA Zone 6b. For turnip, this means a frost-free growing season of roughly 33 weeks running from March 22 to November 10. Cool-season crops like turnip thrive in this zone with both spring and fall planting windows available.
When is turnip harvest season in St. George?
Expect the first turnip harvest in St. George around April 5, with harvest continuing through April 30. This is based on 35–60 days from transplant or direct sow. A fall crop planted September 15–25 adds a second harvest around October 20.
How long does it take to grow turnip in St. George, UT?
From transplant or direct sow to first harvest, turnip takes 35–60 days in St. George's climate. Based on a typical planting date of March 1–11, expect your first harvest around April 5. St. George's Zone 6b transition-zone climate produces maturity times right in the middle of the stated range.
What soil does turnip need in St. George?
St. George's caliche subsoil is effectively rock — traditional in-ground planting of turnip 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.