Anyone had any experiences, good or bad doing this? They will be stored in garage where it
very rarely gets to  freezing.

I've done it. I believe it helps give the plant a boost in the spring as the roots have all of that new medium to expand into while the tops are still mostly dormant. Just don't waterlog the new mix before adding it and the fig trees to the larger pots.

I have some info on the process to share. To me it makes sense that what Neil said above would be the case.
I did most of my trees last year after dormancy, and left the biggest up pots until March to save space in the garage. One of the up pots I did was with a tree that I acquired in late fall ( I'll call this tree #9) and didn't have as big a pot as I wanted at the time so I just got it into what I had. In March when I up potted my bigger trees I also up potted #9, expecting to see some root growth had occured during the dormant period. The soil totally crumbled away and to my surprise, no growth had occured at all. Minimal fresh root growth was observed on the big tree up pots. One more piece of info, #9 was the last tree to come out of dormancy, there could be multiple reasons for this but I just thought to be fair I shold include that info. We'll see if #9 breaks dormancy closer to the others this year.

From what I observed, I don't think you get a huge gain by doing your up potting early in the dormancy period. Do it when you have time but they are still dormant. And like I mentioned earlier, if you do it closer to spring you'll have more room to spare due to the smaller volume of space occupied by last years pots...if space is even an issue.

Mike i upot any time of the year including full heat of summer with no harm as i sneak up on them and there
root system remains undisturbed (important) and right back into full sun.

Wow your plants dont see temps below 32 ?
Shh dont tell my plants that as they see the teens every winter.

Thanks everyone for your input. I plan to up them soon.


Martin, most winters the twenty's and an occasional teen is about what we get. We have had zero but that is not the norm here. Inside
the garage may have gotten below 32 when it got down to zero one time.