When to Plant Zucchini in Tulsa, OK
Published: April 21, 2026
Zucchini Planting Dates for Tulsa, OK
| Start seeds indoors | February 22–March 1 |
| Last frost (average) | March 15 |
| Transplant outdoors | March 22–April 1 |
| Direct sow outdoors | March 22–April 1 |
| Minimum soil temperature | 65°F |
| Expect first harvest | May 6 – May 16 |
| Fall crop planting | September 20–30 |
| Fall crop harvest | November 4 |
| First fall frost (average) | November 15 |
Best Zucchini Varieties for Tulsa, OK
For Zone 7a Tulsa, the best-performing zucchini varieties are Black Beauty, Patio Star, and Golden Egg — all widely adapted, disease-resistant varieties proven across the transition zone. Astia is a good alternative where disease resistance matters most, especially in humid summers. These varieties are typically stocked by local nurseries and are the safest bets for gardeners new to zucchini in Tulsa.
Growing Zucchini in Tulsa
Tulsa sits in Zone 7a, with an average last frost of March 15 and first fall frost around November 15 — giving a 245-day frost-free growing season. Warm-season crops like zucchini need soil at 65°F or above before transplanting; Tulsa's frost calendar puts that window clearly in the late-spring to early-fall range.
Tulsa's moderate climate supports zucchini 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.
Tulsa's Zone 7a is classic transition territory for zucchini. The season is long enough for a full warm-season crop without needing aggressive indoor starting — 6 weeks before last frost is enough for most varieties. Late frosts are the main risk; keep row cover available until 2 weeks after your average last frost.
Tulsa's heavy clay soil benefits from raised beds or deep organic matter amendment before planting zucchini. Clay retains moisture well but compacts easily — add 3 to 4 inches of compost and work it in to 12 inches before planting. Consistent watering (2 inches per week) is especially important in clay soil, which can crack and pull away from roots during dry spells; mulch around plants to stabilize moisture.
Zucchini Calendar for Tulsa
| Month | Task |
|---|---|
| February | Start seeds indoors under grow lights |
| March | Transplant outdoors into warm soil |
| May | Expect first harvest window to open |
| September | Start fall crop — transplants or direct sow |
| November | First fall frost — harvest remaining, end of outdoor season |
Zucchini Tips for Tulsa Gardeners
- •Start with just 1–2 plants — zucchini are so productive that more is rarely needed.
- •Harvest at 6–8 inches for peak flavor; zucchini left on the plant signals it to stop producing.
- •Succession plant zucchini in Tulsa every 2–3 weeks through spring to extend the harvest window into summer.
Common Zucchini Pests in Tulsa
- •Squash Vine Borer — peaks July in Zone 7a (active May–September); sudden wilting with frass at stem base; inject Bt into the stem or use row covers through flowering.
- •Squash Bug — peaks July in Zone 7a (active May–September); gray-brown shield bugs that suck plant sap; handpick and destroy egg clusters on leaf undersides.
- •Powdery Mildew — peaks July in Zone 7a (active May–September); white powdery coating on leaves; improve airflow and apply milk spray (1:9 milk-to-water).
Check plants every 2–3 days during peak season — early intervention prevents most infestations from becoming serious.
What to Plant with Zucchini in Tulsa
In Tulsa's moderate climate, Corn and Bush Beans are the most beneficial plants to grow alongside zucchini. Corn provides vertical support for climbing companions in the Three Sisters planting. Keep zucchini away from Potato — it competes for nutrients and shares blight diseases.
Frequently Asked Questions
When should I plant zucchini in Tulsa, OK?
In Tulsa (Zone 7a), start zucchini seeds indoors around February 22–March 1 and transplant outdoors around March 22–April 1. The city's average last frost of March 15 is the anchor date — count 3 weeks back for seed starting and 1 weeks forward for transplanting.
What zone is Tulsa, OK for zucchini growing?
Tulsa is USDA Zone 7a. For zucchini, this means a frost-free growing season of roughly 35 weeks running from March 15 to November 15. This is a comfortable window for warm-season crops like zucchini — standard varieties work well.
When is zucchini harvest season in Tulsa?
Expect the first zucchini harvest in Tulsa around May 6, with harvest continuing through May 16. This is based on 45–55 days from transplant or direct sow. A fall crop planted September 20–30 adds a second harvest around November 4.
How long does it take to grow zucchini in Tulsa, OK?
From transplant or direct sow to first harvest, zucchini takes 45–55 days in Tulsa's climate. Based on a typical planting date of March 22–April 1, expect your first harvest around May 6. Tulsa's Zone 7a transition-zone climate produces maturity times right in the middle of the stated range.
What soil does zucchini need in Tulsa?
Tulsa's heavy clay soil compacts easily and drains slowly — problematic for zucchini which needs oxygenated roots. Build a raised bed or amend deeply with 3–4 inches of compost worked into the top 12 inches. Add gypsum if the soil is severely compacted. Consistent watering matters especially in clay because the soil can crack and pull away from roots during dry spells.