Hope you can help with an ID.
Picture is from 6/25 a few years ago growing in zone 4 (MN). Growing on a 8' tall trellis as I recall.
Thanks in Advance!
Looks like Clematis texensis, perhaps 'Princess Diana'.
Here is a link that might be useful: Clematis 'Princess Diana'
Looks more like a "Duchess of Albany" to me.
I have both. PD is a shade darker pink w 4 petals and DoA is lighter w 6 petals. PD, with EFH parentage, blooms much earlier in my garden
Sir Trevor Lawrence is another possibility, or it may be an unnamed cross with texensis parentage.