Entry-point quota permits for overnight trips, all released at 9 a.m. CT on the last Wednesday in January.
From May 1 to September 30, "Any visitor taking an overnight trip (paddle, motor, or hiking) or a motorized day trip is required to obtain a quota permit". "The quota limits the number of groups entering the BWCAW at a particular entry point each day", and "All quota permits for entry points are released on a first come, first served basis at 9:00 a.m. CT on the last Wednesday in January." Confirmed on https://www.fs.usda.gov/r09/superior/passes/boundary-waters-canoe-area-wilderness-permits. The last-Wednesday-in-January 9 a.m. release is the scarcity moment this target watches for.
Updated , checked by hand against the target's own page.
Watched from fs.usda.gov, the target's own public page — not a reservation system we poll.