Babs, I used to grow a bunch of different cultivars in my old garden....just not a big fan of bearded iris.....but I don't recall any that had a very long bloom period and for sure none of mine were remontant! As best as I can remember, these are most of what I grew (nothing very exotic):

Flight of Butterflies

Butter and Sugar

Ruffed Velvet

Shaker's Prayer

Chartreuse Bounty

Roaring Jelly

Over in Gloryland.

I now focus on species iris and Pacific Coast hybrids but some of the newer cultivars of Sibes have some really amazing coloring - Cream of Tomato and Paprikash are calling to me :-)

It seems to me that bloom time and repeat blooming aren't well recorded for Siberian irises. However, I see that reputable vendors such as Joe Pye Weed's Garden, Ensata Gardens, Mt Pleasant Iris Farm, and Aitken Salmon Creek Garden list certain varieties as repeat bloomers and sometimes comment on the length and/or strength of bloom. JPW is in your neck of the woods, Babs. I've had limited experience growing SIBs, but these vendors, who are also hybridizers, have earned their reputation over time and are incredibly well respected. Check out their websites.

Please let us know what you end up buying for your garden!