Hi Jeri - welcome to the forums!
In answer to your question about where your monarchs go, it all depends on when you are raising and releasing them. If you are doing this in the summer, your monarchs should stick around as a part of the local population - as long as there are plenty of nectar sources and milkweed for the females to use for egg-laying.
If you are raising and releasing your monarchs late in the fall they could be migratory and they should be heading to Mexico with the rest of the eastern North American population. The only way to try and find out where they are going is to tag a bunch of them before you release them and hope you have some recovered further south.
It looks like San Luis Valley is located just to the east of the Continental Divide so you could order a tagging kit from Monarch Watch and participate in our 2004 fall tagging program. If you want to try this, more information is available on our site at
and an order form is available at
You should concentrate your tagging efforts during the peak migration in your area, which you can look up at
Hope this helps!