Go for it. Cucumber seeds are not really durable. Most won't make it through winter. They quickly rot if the conditions are not just right for germinating. I have seldom had cucumber seed come up volunteer from last years cukes left on the garden. Squash and pumpkin seed, on the other hand, are able to winter over and grow next year.
Gardening at 5000 feet elevation, zone 4/5 Northern Utah, Frost free from May 25 to September 8 +/-