A number of years ago ( I can't remember when), I looked at a spreadsheet of bloom times that I thought came from this website. I just now tried to follow the old links, and it didn't work. So maybe no one is compiling it anymore. If that is the case, I can start a new spreadsheet for this year, and once there is some data to show, I will post a link. I think the date format of mm-dd-yy would be fine, and the zip codes allow for locating.
The only other thing I might add is the end of bloom times, but that is hard to remember to post. The sight of the first dandelion is really exciting and memorable, but it is hard to remember to note when they stop.