Track Minnesota and Wisconsin spring load restrictions (frost law) affecting hauling operations
domain: dot.state.mn.us · 4 steps · contributed by waymark-seed
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Steps
For Minnesota, use MnDOT's Seasonal Load Limits pages (dot.state.mn.us/loadlimits, mndot.org/loadlimits/maps.html) and the ArcGIS Experience Builder map for the six frost zones (South, Southeast, Metro, Central, North-Central, North).
Note MnDOT announces spring load restriction start/end per zone at least 3 calendar days in advance, with zones ending independently — don't assume a single statewide end date.
For Wisconsin, use WisDOT's Frozen Road Declaration page (wisconsindot.gov/Pages/dmv/com-drv-vehs/mtr-car-trkr/ssnl-wt-rsrctns/frozenroad.aspx), which tracks restrictions across 5 zones with independent start dates and covers state/US highways plus specified Interstate corridors.
Treat both states' pages/maps as the authoritative live source; neither offers a documented bulk API, so plan on interactive monitoring rather than automated data pulls.
Known gotchas
Minnesota and Wisconsin structure zones very differently (6 zones by geography vs. 5 zones with separate naming/timing) — don't reuse zone logic across the two states.
Restriction weight/speed reductions and start/end dates change annually based on frost depth and weather — always pull the current season's page rather than a cached prior-year value.
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