Question 1

When should I plant watermelon in ZIP 74103?

Accepted Answer

In ZIP 74103, the main watermelon target is around Apr 19, based on the representative Tulsa frost station and USDA zone 7b.

Question 2

When should I start watermelon seeds indoors in 74103?

Accepted Answer

Start watermelon seeds indoors in ZIP 74103 around Mar 15, about 21 days before the Apr 5 last-frost estimate.

Question 3

When is the last frost in Tulsa?

Accepted Answer

Tulsa (ZIP 74103) has an average last spring frost around Apr 5, based on the representative Tulsa frost station.

Question 4

When is the first frost in Tulsa?

Accepted Answer

Tulsa (ZIP 74103) has an average first fall frost around Oct 30, leaving about 208 frost-free days.

Question 5

Is this a guaranteed planting date?

Accepted Answer

No. GrowZone uses frost-date estimates, hardiness zones, and crop timing rules for planning. Local microclimates and current weather can shift the right date.

Step	Date	How to use it
Start Indoors	March 15, 2026	Start seeds under lights or in a bright indoor seed-starting space.
Transplant Outdoors	April 19, 2026	Move hardened-off seedlings outside after the frost-risk window.
Direct Sow	April 19, 2026	Sow seed outside when the crop and soil can handle the window.

Start watermelon seeds indoors around Mar 15

Watermelon dates for Tulsa, OK