Oregon Pool Season: Opening & Closing Dates by City

Local dates for every featured Oregon city — when the water warms up, when it cools off, and how long the season actually lasts.

City Opening window Closing window Season
Portland Jun 7 – Jul 10 Aug 26 – Sep 25 ≈ 82 days
Eugene Jun 20 – Jul 3 Sep 2 – Sep 18 ≈ 61 days
Bend Jun 30 – Jul 11 Aug 18 – Aug 31 ≈ 38 days
Medford May 23 – Jun 19 Sep 14 – Sep 30 ≈ 108 days

Windows show the stretch when each city's daily average passes through the low-to-mid 60s°F (1991–2020 NOAA records, nearest station to each city). Click a city for its month-by-month table and full season notes.

Season geography

Across Oregon's featured cities, typical openings spread from Jun 6 to Jul 11, closings from Aug 18 to Sep 22, and the unheated season runs 38–108 days depending on where you are. Elevation, coastal water, and urban heat all pull real dates around, which is exactly why a state-level answer isn't enough.

For your exact town, the pool season lookup takes a ZIP code. Opening day itself is a chemistry job — the dosing calculator turns your first test reading of the year into exact amounts.

Oregon planning pages

When to open — Oregon When to close — Oregon All states →