I just planted a Multihead plant about 2.5 weeks ago here in Colorado. The jury is still out as to whether or not it’s gonna take. But it’s not dead yet, so I’m optimistic. August/September seems late to me. I’m not sure there would be a whole lot of benefit vs waiting until next April/May to plant.
If you decide to wait until spring, get a rooted plant from Great Lakes Hops. If you roll this dice this year, maybe do rhizomes, because they’re cheaper.