Oregon watermelon season
When to expect peak Hermiston melons — and how to store them once you get one home.
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.
Related: Hermiston watermelon history · Picking guide