Chris Nelson and his family from Vashon Island have ran the Christmas-tree stand on Juanita Drive and N.E. 141st in Kirkland for four years.
The stand is open through Dec. 24.
Council members hope the increased presence of officials will deter break-ins at trailheads.
Both directions of traffic will be closed around the clock until June 4.
For those possibly exposed to measles between April 30 and May 3, the most likely time to become sick would be between May 7 and 24.