Transplant from pot to ground or just a repot? When? Where are you located? Any strange weather events?

from pot to ground. We have been getting more rain than usual, but not very much. Thank you for responding. I even dug up the tree to see if there was any rat damage, but could see no signs and roots looked healthy, although, thinking about it, root ball was quite small and certainly not root-bound, which I was initially worried about.

Sorry...I am in zone 9... about 2 miles north of San Francisco. I am worried it suffered when we transplanted it from a pot into the ground. It is getting a little less sun than it was getting in the pot. It was doing so well, new, green leaves...then crash! I watered it deeply every few days after it was transplanted and the root ball was not dry when I dug it up. Our lowest temp was around 45 F. Thank you so much for trying to help. I really appreciate it.

Yes, I think you may be looking at just some transplant shock. Can't be certain but that seems most likely. In that case, continue to water as necessary but don't over water. I'd also try to rig up some additional temporary shade as well.

Maples have an ability to releaf after some stress causes loss of foliage so just be patient :-) And keep your fingers crossed!

Oh, thank you so much for that. So hope that is all it is. Thanks again.