Thank you for your report to the Hotline! Tent caterpillars are native across much of the west. While they do cause damage to trees, it is generally not enough to warrant management. Outbreaks tent to last a couple years and then the populations subside again.

You can read more about tent caterpillars here: https://pace.oregonstate.edu/courses/sites/default/files/resources/pdf/fsbdev2_042847.pdf

Thanks again for your report!

-Lindsey

Lindsey Wise
July 13, 2016, 1:56 a.m.