Oregon watermelon season

When to expect peak Hermiston melons — and how to store them once you get one home.

Watermelons growing in rows on irrigated farmland

2026 Hermiston watermelon season

For July 2026, expect the first serious retail volume around mid-month as sustained heat pushes melons to full ripeness. Farm stands and Northwest grocery chains typically label Hermiston watermelons from late July through August. Warm springs can advance the calendar by a week or two; cool, wet Junes delay the first pick. This page is updated each summer as harvest timing firms up.

Hermiston harvest calendar

Period	What to expect
Late June	Early pick possible in warm years; limited supply
Mid-July – early August	Peak harvest — best selection and flavor
Mid–late August	Strong supply; Umatilla County Fair & MelonFest season
September	Season winds down; buy local while available

Growers typically begin serious picking when sustained heat pushes fruit to full maturity — often around July 10–15 in average years. Triple-digit July days accelerate ripening.

Where to buy Hermiston watermelons

Northwest grocery chains — look for "Grown in Hermiston, Oregon" signage
Farm stands in Umatilla County during harvest (see our grower directory)
Portland and Seattle markets — regional distributors supply major metros
Canadian border cities — Hermiston melons cross into BC regularly

Storage tips

Keep whole melons at room temperature until cut — refrigeration can dull flavor if applied too early. Once sliced, cover and refrigerate; use within 3–5 days. For best taste, buy in-season and eat within a week.

Events

Plan a visit around the Umatilla County Fair (August) or downtown MelonFest for seed-spitting contests, bathtub races, and community celebrations tied to the crop.