Half Dome Cancellations: Drop History
Our scanner has recorded 269 availability changes for Half Dome. Here's when they actually happened.
PermitCast forecast
Odds of an opening for Half Dome
The odds that our scanner catches at least one availability opening for this permit in the window ahead — based on how often it actually has, not a guess.
Next 7 days
Low chance
Next 14 days
Moderate chance
Based on 8 weeks of our scan history. Forecast last updated Aug 24, 2026.
Changes by month
Every month is a real count of scanner-detected availability changes for Half Dome — not an estimate.
| Month | Changes detected |
|---|---|
| February 2026 | 0 |
| March 2026 | 0 |
| April 2026 | 0 |
| May 2026 | 0 |
| June 2026 | 0 |
| July 2026 | 206 |
| August 2026so far this month | 63 |
Last scanned Aug 24, 4:51 PM PDT. Counts respect our availability-change epoch (2026-07-03) — earlier scanner history isn't comparable and is excluded.
Best times to watch
We haven't recorded enough openings for Half Dome to break this down by day and time yet. The grid has 28 squares, and we only draw it once a permit has at least 140 recorded openings — below that the darkest square is picked by chance rather than by a real pattern, so we leave it out.
Half Dome drop report questions
How often does Half Dome availability actually move?
Our scanner has recorded 269 availability changes for Half Dome since it started tracking, broken down by month above. A change is any shift in the open-date set, so it counts dates closing as well as dates opening.
When is the best time to check for Half Dome cancellations?
We haven't recorded enough openings for Half Dome to answer this honestly. The grid has 28 squares and we only draw it once a permit has at least 140 recorded openings, so the darkest square means something. Below that we leave it out.
How fast will I find out if a Half Dome date opens up?
Paid plans are scanned about every minute with alerts within seconds. Free accounts are scanned hourly. Either way, PermitSnag catches the change — you don't have to refresh the page yourself.