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ZIP 44114 planting calendar

When to plant watermelon in Cleveland, OH - Zone 6b

In ZIP 44114, plant watermelon around May 19; this uses the Cleveland frost station, USDA zone 6b, and watermelon timing rules.

Your Cleveland calendar has a 168-day estimated frost-free season. This estimate uses the representative Cleveland frost station, USDA zone 6b, and watermelon timing rules.

Source: cleveland-hopkins frost station, USDA zone 6b, last updated 2026-06-28. Verify locally before planting high-value crops because microclimates, current weather, and yard exposure can move the safe date.

Reviewed by GrowZone Editorial. Calculated from the cleveland-hopkins frost station and USDA zone 6b, last updated 2026-06-28.

In the Cleveland area, watermelon timing follows the Cleveland frost window, so the local ZIP date can differ from a broad zone-only calendar.

USDA zone 6b Cleveland frost station Ohio State University Extension Updated 2026-06-28
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Answer first

When to start watermelon seeds indoors in Cleveland

In ZIP 44114, start watermelon seeds indoors around Apr 14, about 21 days before the May 5 last-frost estimate.

Start watermelon seeds indoors in Cleveland around Apr 14, about 21 days before the May 5 last-frost estimate.

Seed starting schedule

Watermelon dates for Cleveland, OH

StepDateHow to use it
Start IndoorsApril 14, 2026Start seeds under lights or in a bright indoor seed-starting space.
Transplant OutdoorsMay 19, 2026Move hardened-off seedlings outside after the frost-risk window.
Direct SowMay 19, 2026Sow seed outside when the crop and soil can handle the window.

Last frost

When is the last frost in Cleveland?

Cleveland (ZIP 44114) has an average last spring frost around May 5.

First frost

When is the first frost in Cleveland?

The average first fall frost is around Oct 20, giving about 168 frost-free days.

Season map

Watermelon windows by month

JanFebMarAprMayJunJulAugSepOctNovDec
Start indoors
Apr 14
Direct sow
May 19
Transplant
May 19
Harvest
Aug 17
Frost watch
Jul 22

Reminder workflow

Every date has a next action

Start watermelon indoorsApr 14
Last frost windowMay 5
Direct sow watermelonMay 19
Transplant watermelonMay 19
Last watermelon sowing targetJul 22
First watermelon harvest windowAug 17
SignalValueWhy it matters
Last frost estimateMay 5, 2026Warm-season transplant risk starts falling after this window.
First frost estimateOctober 20, 2026Fall planting counts backward from this date.
Season length168 daysLonger seasons can support succession crops.
Spacing36-60 inAirflow and root space affect yield.
Soil temperature70 F+Seeds and transplants stall in cold soil.

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Local data

Why this date changes by ZIP

Cleveland frost history and USDA zone 6b shift the safe planting window. GrowZone uses a local representative station instead of one national rule.

Ohio State University Extension is the kind of local source to verify against when a crop is expensive, weather is unusual, or your yard has a cold pocket.

Crop note

Watermelon timing notes

Wait for warm soil; watermelon stalls when nights stay cool. Watermelon prefers full sun, 36-60 in spacing, and soil near 70 F+.

For fall, count backward from Oct 20. A conservative last sowing target is around Jul 22.