| Event | Locale | 2010 | 2011 | 2012 | 2013 |
|---|---|---|---|---|---|
| First Robin | Wauwatosa, WI | Feb 20 | Mar 6 | ||
| Spring Peepers Appearance | New Berlin | Apr 5 | Mar 12 | ||
| Yellow Trout Lilies -complete flowering | Wauwatosa | May 2 | |||
| First mosquito | Wauwatosa | May 24 | May 31 | ||
| First Little Brown Bat | Wauwatosa | May 31 | |||
| First crickets | Wauwatosa | July 22 | |||
| Last Firefly | Wauwatosa | Aug 22 | |||
| First Frost | Wauwatosa | Sept 21 |