What certification rules does List Hiker check?

Every list has its own fine print, and List Hiker knows it. Some examples:

• Season boundaries — "season" hikes must start and end without crossing the official boundary, and the definition differs by list: astronomical seasons for New England lists, calendar seasons for pan-Northeast and other lists.
• Month boundaries — "month" list hikes must start and end within the month, in local time. (All date tracking is in local time.)
• Peak-per-hike rules — Trailwrights counts only one peak per hike, even if you tagged five. Most lists allow multiple peaks in one hike.
• Full-segment rules — the Terrifying 25 requires the entire length of each listed trail (partial segments may be completed across different hikes). It has 20 required trails plus 15 electives of which you must do five, and blackout dates where hikes don't qualify.
• Changing lists and grandfathering — lists like 52 With A View and the Catskill 3500 change their allowed peaks over time, with grandfathering or time limits for older peaks.
• Local exceptions — the Colorado 14ers count a peak like Mt. Bross (private property) if you traverse the public trail nearest the summit.
• Counting — traversing a peak more than once in a single hike counts once; a single hike can count toward multiple lists.
• Plausibility — elevation gain and loss must be plausible for the peak, and average and peak speed must be within reasonable human capability (with margin for GPS error and allowances for backcountry skiing).

You don't have to memorize any of this — List Hiker checks every hike against the right rules automatically, so you find problems before you submit.