Onions are unique in that they require the right length of day to bulb. There are long day, short day, and neutral types. If you planted the wrong type, they would not bulb. Any of them would make nice green onions.
I would think that you would want long day onions there. Also they need to be planted very early, late March or early April. They need to get in some good growing time before the days are of the right length for them to bulb.
No more than a few sets cost, it would be worth the experiment. Maybe next year?
Gardening at 5000 feet elevation, zone 4/5 Northern Utah, Frost free from May 25 to September 8 +/-