Should I dig up this owari satsuma or let it ride

Hard to tell if it's above or below the graft. Let those leaves flush out over the next week and we'll know for sure. If the leaves are trifoliate (triplet leaves in each cluster) then you know the satsuma is dead and you are only growing the worthless rootstock from below the graft.

If it's above the graft I'd absolutely keep it. A mature root system planted in 2016 will make a new tree for you faster than planting a small one will.

Actually I kind of think I can see the graft line on the second picture. It's very grainy so not certain. But if I'm right then you just narrowly saved the satsuma.

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If it's above the graft I'd absolutely keep it. A mature root system planted in 2016 will make a new tree for you faster than planting a small one will.

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This.

As the graft union is fairly low on the trunk, I think you have live Owario scion sprouting, and with that large established root system you’ll get rapid growth from new sprout(s). I would encourage you to train single central leader truck from one the new sprouts & cut back the existing trunk to right above the one you chose to keep as the new central leader.

Pruning info on citrus, likely more than you or me need to know but informative just the same. LINK.

I’m in the same boat as you with Owari, but not as much cold damage on an a Brown Select.

Thanks
Here’s a better picture of second view

I believe the sprouts you show are above the graft. However, rather than lose another couple of years, I wouldn’t risk it. I would dig up and start over this year.

I took measure on my satsuma and all lived but all with damage. Oldest is a brown select. Second oldest is a owari. Youngest planted last year is an artic frost.

Anyone out there have an artic frost that lived without adding any heat like a light or a space heater?

How do these look?