[dice]

The most vigorous growing ones in our cool spring this year of those
that I have planted have been Cosmonaut Volkov, Koroleva, Robson
Angolan, Victoria, and Lithuanian (and some hybrid plants at
various stages of F-2,3,4 development). I expect Victoria to be
the earliest of those, based on other people's reports.

The Cosmonaut Volkov seeds were from trades, but it is widely
available. Koroleva and Lithuanian were from Tania. Robson Angolan
was from Sandhill Preservation. Victoria was from a trade but Sandhill
lists it in their catalog.

edit:
Siberian and Spiridinovskie seem to be doing well, too, but those
are smaller plants by nature, in containers right next to a low
concrete wall that retains heat and radiates it back at night,
so I cannot fairly compare their rate of development with
indeterminates that have been growing in the open ground.