Most West Nile cases in Colorado happen between July and September, though mosquitoes can live until the first snow or hard freeze.

ADAMS COUNTY, Colo. — Health department officials in Adams County said two people have confirmed cases of West Nile Virus. The people contracted the virus in late June, the Adams County Health Department said in a release. The health department did not disclose if the people infected had or have symptoms, or if they had to be hospitalized.