ROOTED IN REAL DATA Historical data. Thoughtful planning. No weather guarantees.
The growing library

When to plant
watermelon.

A fruiting vine with seed and transplant maturity references.

Direct sowReviewed
01 / Right crop, right place

Where the timing comes from

Choose the region that actually covers your garden. These source references are not a nationwide planting calendar.

Spring frost-relative reference

Colorado

2+ weeks after the spring frost reference

The source anchor is the average last spring frost. This is an earliest reference, not an open-ended planting season.

  • Check garden soil temperature, workable soil and current weather.
  • Protect or delay frost-sensitive plants while frost remains possible.

A NOAA station’s median 32°F freeze date is a different measure. Substituting it is an application calculation, not a published local calendar.

Published regional calendar

Central North Carolina

Use the Central North Carolina calendar, with its separate establishment methods. This is not a calendar for every part of North Carolina.

Published crop row
Melons, watermelon
Published regional calendar

Florida

Use the Florida calendar for your specific subregion. Planting months are not interchangeable across the state.

Published crop row
Watermelon
Reviewed Florida rows
North · Central · South

Outside these regions? Use your local Extension planting guidance. A nearby weather station describes climate; it does not establish whether or when to plant this crop.

02 / Know when the clock starts

How long until harvest?

These ranges start at different stages. Keep the method, region, and crop type attached to every number.

Central North Carolina
62–72days

From transplanting

Count from setting out transplants. The earlier nursery period is excluded.

Source crop: Melons, watermelonRead source
Central North Carolina
90–100days

From direct sowing

Count from seed sown directly in the garden.

Source crop: Melons, watermelonRead source

A transplant has a head start. Days counted from transplanting leave out time spent raising the seedling. Use a separate seed-starting reference if you plan to raise your own plants.

03 / Before you plant

The details that matter

Cucurbitaceae

Plan for watermelon

  • Soil warmth and the forecast can require delaying planting beyond a historical freeze-date reference.

Maturity references vary with cultivar, harvest size, weather, and establishment method. Keep your seed packet or transplant label alongside the regional calendar.

Soil temperature

60°F

Published germination minimum · Colorado

A source germination minimum, not an optimum or a transplant threshold; do not treat the number as a guarantee.

Read soil-temperature source
Open evidence

Follow the sources.

Selected source facts reviewed . This is our review date, not the sources’ publication date.

How we use the data
  1. NC State Extension · Central North Carolina Planting Calendar
  2. Colorado State University Extension · Vegetable Planting Guide
  3. UF/IFAS Extension · Florida Vegetable Gardening Guide