Three Fall Migration Maps (Click a map for the live view.) ALL sightings >> Overnight ROOSTS >> PEAK migration >> ALL monarch sightings go on this map. Some people report single monarchs, others report larger numbers. These reports are very important. They help us determine when the migration peaks. Roosts Monarchs rest at overnight roosts at the end of each migration day. This map shows where large gatherings of resting butterflies were seen! Peak Spectacular sightings--or the season's biggest wave of migration--are shown on this map. It shows when and where we think the migration was at its peak. Why fall Monarch Migration is difficult to map...>> About the Data and Legend Legend Each color shows one week. Each observation is shown as a dot on the map. The dots are color-coded. A different color is used every week. (Notice dates of legend).   More About Mapping... Mapping Basics >>   Analyzing Journey North Maps >> Variables to Explore >> Weather, Climate and Resource Maps

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