The two Pacific Northwest clubs traded headed goals to finish level in Portland.
Ryan Johnson got the scoring started a few minutes after halftime. The Timbers caught the visitors on the break, and Diego Valeri's deep lofted cross was aimed perfectly for Johnson's head.
Vancouver equalized from a corner in the 69th minute. Jordan Harvey, already in a record season for goals, grabbed his fourth of the year with a glancing header at the near post.
Both teams are in the playoff spots. After 22 matches apiece, The Timbers are third in the West with 35 points, and the Whitecaps are fifth, with 33.