Monarch population is nearly flat but greatly reduced from previous decades. Pestacides in your garden could be lethal to monarch caterpillars nearby. Interstate 35 is becoming the Monarch highway. Milkweed in my backyard. Where are the monarchs vacationing in Mexico?
Western population numbers - http://monarchjointventure.org/news-events/news/western-overwintering-population-2014-15
Monarch Watch Population Status - http://monarchwatch.org/blog/2015/01/27/monarch-population-status-22/
Winter roosting sites in Mexico - http://www.learner.org/jnorth/tm/monarch/PopulationMexicoSites.html