Cool Portland Rose Garden In September 2023. Web great city views are available all year long, but may through september are the best times to see roses. The oldest official continuously operated public rose test garden in the united states, the portland international rose test garden in washington park features more than 10,000 roses, great.
The best months to visit are june through september, when the roses are in bloom. Web portland international rose test garden. Summer weather in portland is pure bliss, which is great for anyone visiting the portland rose garden at peak bloom.