The summer quota season, when the daily limit drops to 110 climbers.
The Forest Service's own Mount St. Helens page requires a climbing permit year-round above 4,800 ft. From April 1 to October 31, permits are sold first come, first served on Recreation.gov, released a month at a time on the first day of the preceding month at 7 a.m. Pacific (April permits on March 1). We alert at each release.
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.