"Acro" - Basically, it means that it is not on the ground. That
doesn't exactly mean that they are winter friendly, but at least
they will not be buried under two feet of snow on the ground. Also,
some Acros may be more elevated than others. Some are pretty easy,
and some are very difficult. These caches are available to
everyone, but not everyone will be able to make the finds. Some
require good amounts of agility and balance. If you don't have
them, then go with someone that does, or skip these caches. It
would be wise to bring a friend and/or a cell phone. Good luck!
(This is a general note for all Acros)