There was a thread on 2020 and 2021:

https://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=518598

https://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=532398&page=1

The first ribbon in 2021 was in Ohio on March 15 so those in Ohio may chime in and tell us if you have ribbons?



I did have ribbons March 15 or 16 last year.

Certainly it can't be March 15 in MI this year as I have ice strong enough to hold a few people yet.
I recall the typical date being around the 1st of April but usually is within a week of ice out.

It appears that water temps and possibly amount of daylight hours is the key? In this case we have the daylight but we don't have the water temps we need yet