- The sound of the auto races has been roaring through Portland for 70 years, and these days, it's NASCAR stock car races every Friday night. In the beginning of July, there's a Destruction Derby with fireworks. Other fun events include 300-lap Enduro races Memorial Day and Labor Day. The season runs April through September. Gates open at 5pm and races start at 7pm. Admission is USD11 for adults; USD8 for seniors and military; USD5 for juniors 13-17 and USD3 for children 6-12.
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