The New Hampshire Department of Health and Human Services says this is the riskiest time to contract diseases from mosquitoes.
Officials say that risk is still present until there's a statewide hard frost when temperatures drop below freezing for several hours. They say insect repellants should continue to be worn for outdoor activities by everyone.
New Hampshire people and animals are at a risk for three mosquito-borne diseases: Eastern Equine Encephalitis, West Nile Virus and Jamestown Canyon Virus.
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Since 2004, there have been 15 human infections with Eastern Equine Encephalitis identified in New Hampshire. West Nile Virus was first identified in the state in 2000 and since then, there have been seven cases. Since 2013, a total of seven Jamestown Canyon Virus cases have been reported.