Yakima County Washington
For people doing field work in the riparian zones of Yakima County, as of April 12 the leaflets on the poison ivy had not yet emerged. The stems (usually 12 to 18 inches tall on plants along the Naches and Yakima Rivers) can cause a skin irritation. You can often find a few lingering berries still hanging on the stems. The leaf nodes are in opposing pairs on the stems. Leaves typically are out in May.