Find an Overwintering Site

Use the map below to find an overwintering site by zooming in to areas you are interested in visiting. You can click each site to get some basic information such as the site name, lat/long, the last time the site was monitored, how many monarchs were counted, etc.

If you would like additional information about a site, contact and we can provide a site-specific report. Do you know about a site that’s not included on the map? Let us know–this is a living map and we try to update it annually with new reports. Also, please note that we have not included known a handful of sensitive overwintering locations on this map due to concerns by the landowner. Please contact if you are interested in a site you cannot find on the map.

A Note on Site Access
The popup for each site will let you know what type of access to expect at the site. There are three types:

1) Open access: These sites are generally open to the public and do not need permission to visit. However, some of these sites (such as those located on State Park lands or in botanic gardens) require day-use fees or entrance fees. You are responsible for having the appropriate recreation pass or paying the day use fee to count this site.

2) Private – permission needed to access site: These sites are usually private homes or golf course sites and surveys must be coordinated with the owner or manager of the property. Xerces staff or your regional coordinator may be able to provide information and contacts necessary to facilitate this access. Do not trepass!

3) Unknown access – might be private: This category includes many historic sites that have not been monitored in recent years. These can be great sites for small groups to adopt and investigate! Often, the location of this site is not well defined and we do not know if the site still exists, hosts monarchs, and/or who the property owner is. For these types of sites, we need a special kind of volunteer. Monitoring these sites means taking on an additional challenge – you may need to survey a large area based on vague location descriptions and report back on your findings. Monitors for these sites will work closely with Xerces or your regional coordinator to document and monitor potential overwintering areas.