Here's the dates of frost in May for the last few years.
2001: none
2002: 3rd & 18th
2003: none
2004: 3rd & 5th
2005: 3rd & 4th
2006: 6th
2007: none
2008: 4th & 19th
2009: 17th
- Quads, hailing from Grand Marsh Observatory atop Elk Castle Hill
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