The effort is designed to help mitigate the economic losses from the deadly Oso mudslide.
County Executive Director Gary Haakenson said Tuesday the county wants to let nearby residents and tourists know that the area "has great outdoor recreation opportunities and summer festivals" and that hasn't changed.
The March 22 slide killed 41 people and left two missing.
The county's economic development office plans to invest in park improvements, trailhead signs and route markers, as well as using a multimedia advertising campaign. Marketing efforts are expected to begin by early June.