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| NTD | Not Too Difficult | Lightly Strenuous |
| MOD | MODerate | Moderate to Strenuous |
| MSD | MoSt Difficult | Very Strenuous, Difficult |
| EXT | EXTreme | An MSD with special requirements |
A category rating may be modified with "+" or "-" to show increased or decreased difficulty, respectively, within the category rating.
WMC Activities ratings are based on a system devised for hikes by Kip Yost, which in turn is based on Dale Green's hike ratings table.
With the new trails, trailheads, and trail tracking tools, Dan Smith has developed an expanded ratings database that can be downloaded as KMZ and GPX files. This database will be continually updated as club members provide additional trail data.