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Winter Load Increases - Minnesota Statutes Zone Boundary Descriptions Average Starting Date Contour Average Ending Date Contour Cumulative Freezing Index Maps Cumulative Thawing Index Maps Frost and Thaw Depth Graphs Definitions and Criteria for Starting and Ending Dates Historical Winter Load Increase Dates   Office of Materials & Road Research • E-mail: MaterialsLab.DOT@state.mn.us • 1400 Gervais Avenue • Maplewood, MN 55109-2044 • Phone: (651) 366-5592 • FAX: (651) 366-5461 © 2012 Minnesota Department of Transportation • 395 John Ireland Boulevard • St. Paul, MN 55155-1899 • Phone: 800/657-3774 • 800/627-3529(TTY, Voice, ASCII) A to Z | Getting Around | About Mn/DOT | Accessibility | Disclaimer and Legal | Doing Business | Contact Mn/DOT | News Room | 511 Traveler Service | Careers/Jobs | Links | Northstar | Governor's Site Last Updated: Tuesday, November 13, 2007 - 2:25:33 p.m. Central Standard Time