Wilderness Connect, housed on the University of Montana campus, acknowledges that we are on the traditional lands of the Salish and Kalispel peoples, who have stewarded this land throughout many generations and are its past, present, and future caretakers.
Enter your search criteria below. You can also use the A-to-Z wilderness list, search by location on a map, or search by name or state. For aggregated tables of wilderness data, view the wilderness summary reports.
The Federal laws that established individual wilderness unit, beginning with the Wilderness Act of 1964 and including all subsequent wilderness legislation, are the legally correct source for the wilderness names, locations, original acreage, and dates of designation. Wilderness Connect's National Wilderness Preservation System database, searchable using the form above, began with the following publication, which compiled the legislated acres for all designated wilderness areas: Landres, Peter; Meyer, Shannon. 2000. National Wilderness Preservation System database: key attributes and trends, 1964 through 1999. Gen. Tech. Rep. RMRS-GTR-18-Revised Edition. Ogden, UT: U.S. Department of Agriculture, Rocky Mountain Research Station. 97 p. Download this publication. Current reported acreage figures are the sum of administrative unit acreages reported by each wilderness' managing agency or agencies through annual realty reports.
The most recent data updates include:
- 4/1/19: John D. Dingell, Jr. Conservation, Management, and Recreation Act additions
- 7/1/19: 3,000 acreage Yuki Wilderness donation added
- 9/4/19: Oregon Islands Wilderness acreage updated from 925.06 to 593.06 to be consistent with the 2018 Realty Report, table 8
- 10/7/19: Owyhee River (reduction of 791 acres from 267,137 to 266,346 acres), North Fork Owyhee (reduction of 31 acres from 43,391 to 43,360 acres) and Pole Creek (reduction of 5 acres from 12,535 to 12,530 acres) Wildernesses from the Dingell Act
- 10/8/19: Updates to 4/1/19 estimates of boundary adjustments to Arc Dome (-4 acres), Mt. Moriah (-23 acres) and High Schells (18 acres) from the Dingell Act
- 2/5/20: 22,877 acre Kootznoowoo Wilderness inholding added (only last 4,766 added on this date; the remainder was already included in annual updates between 2016 and 2020)
- 2/12/20: Multiple acreages updated for NPS wildernesses to be consistent with 2018 National Wilderness Report (significant changes mainly to Alaska wildernesses)
- 6/2/20: Multiple acreages updated for BLM wildernesses to be consistent with second quarter NLCS acreages
- 7/19/21: 9,617 acre Sabinoso Wilderness donation added