Garden Tempo

Texas, U.S. · outdoor planting

When to plant watermelon in Texas

Plant watermelon about 1–6 weeks after the local frost-free date after soil and nights are warm. A later crop needs 14–16 weeks before the first freeze; Texas A&M does not publish a watermelon row in its five-region average fall-date table, so refine with the local freeze date and variety maturity.

Choose the Texas timing rule
Spring
1–6 weeks after the local frost-free date
Based on your local frost-free date
Fall
14–16 weeks before the first freeze
Based on your local first freeze
Start with
Direct sow or transplant carefully
Direct sow after warmth arrives, or use a young transplant without disturbing its roots. Reserve enough space for the mature vines.

Spring and fall are different calculations

Start with your local frost date

Texas is too large for one planting day. Spring timing is measured from the local average frost-free date. Fall timing is measured backward from the local first freeze, then checked against the Texas A&M regional anchor when one is published.

Spring rule

1–6 weeks after the local frost-free date

Use the frost-free date for your garden, not a statewide average.

Fall rule

14–16 weeks before the first freeze

Count backward from the local first freeze and leave room for establishment.

Texas A&M gardening regions

Regional planning anchors

The supported statewide rule is frost-relative. Because the five-region fall table does not list watermelon, this page does not invent average dates for Regions I–V.

Region I

Count back 14–16 weeks

Northern Panhandle; calculate from the local first-freeze date.

Region II

Count back 14–16 weeks

West Texas and the High Plains; calculate from the local first-freeze date.

Region III

Count back 14–16 weeks

North, East and Central Texas; calculate from the local first-freeze date.

Region IV

Count back 14–16 weeks

South Texas; calculate from the local first-freeze date.

Region V

Count back 14–16 weeks

Lower Rio Grande Valley; calculate from the local first-freeze date.

Plant only when the crop is ready

The calendar is the first filter

A date can be inside the planning range and still be a poor planting day. Check the crop-specific conditions before committing seed or plants.

  • Cold soil and cold nights have passed.
  • The site has full sun, drainage and enough vine space.
  • A late crop has 14–16 weeks plus establishment margin before freeze.

Method changes timing

How to start watermelon

Direct sow after warmth arrives, or use a young transplant without disturbing its roots. Reserve enough space for the mature vines.

Wait for a warm seed zone

A nominal frost-free date does not make cold soil suitable for watermelon.

Choose variety and space together

Maturity and vine size determine whether the site and remaining season fit.

Protect roots if transplanting

Move a young plant with its root ball intact rather than holding an oversized transplant.

When the simple answer breaks

Early and late decisions

A usable planting page needs an action when weather, region or maturity no longer fits the headline range.

Short northern season

Use a faster variety and the earlier safe window

The Panhandle cannot use a Lower Rio Grande Valley calendar even though both are Texas.

Late summer crop

Stop when the 14–16 week countback fails

Warm weather at planting does not guarantee enough warm time to ripen fruit.

Why this answer is shaped this way

Maturity replaces false regional precision

Where the authoritative region table is silent, the correct decision is the published freeze countback plus the variety’s days to maturity—not an estimated date presented as official.