I'm guessing it will. Amaranth is native and has adapted cultivars here in TX.
I'm not sure tho. I didn't even know what Quinoa was until I found out I had Celiac and had to find alternate foods for common grains.
"Quinoa is sometimes referred to as a "pseudocereal" because it is a broadleaf non-legume that is grown for grain unlike most cereal grains which are grassy plants. It is similar in this respect to the pseudocereals buckwheat and amaranth"PJ

I'd be interested in learning how it turns out. This is an amazingly complete protein source. Whole Foods makes a great dish with it. It originated in South America and considering tomatoes and potatoes and maize (corn) got adopted by Europe, I find it strange that they didn't adopt the really nutritious food. Complete protein sources that don't have lots of fat are hard to find so I wonder why it's not used more in the US.

A friend of mine (San Antonio area) want to grow Quinoa also and has looked at the info about it. It seems that Quinoa is native to the Andes, so it apparently prefers weather that is more moderate than Texas usually has. In other words, hot weather over 90F is a problem for it. And the plant can sustain a bit of damage from freezing temperatures. I'd look for a short-season variety if you can. You could check with Seeds of Change...maybe they have something like that. Or just try what you have and see how it goes. Where it's grown commercially in N. America, it's usually started in spring, but I don't know...those are much cooler climates. Hmmm...maybe early fall?

Bumping this up----did anyone have success with their crop?