Monarch Butterflies
| Spring Milkweed Archives |
| Spring Migration Milkweed Egg Fall Migration Analyzing Data |
| These maps show sightings of the 1st milkweed of the year. Scientists: Contact us for permission to use Journey North data. |
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| Spring 2018 | Spring 2017 | Spring 2016 |
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| Spring 2015 | Spring 2014 | Spring 2013 |
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| Spring 2012 | Spring 2011 | Spring 2010 |
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| Spring 2009 | Spring 2008 | |