South Dakota Frost Laws & Spring Thaw Limits

How South Dakota handles spring thaw

South Dakota can post spring load restrictions from February 15 to April 30 (SDCL 32-22-24). SDDOT knocks affected highway segments down to a reduced axle cap, commonly 6 to 8 tons, not a flat percentage, and the posted routes re-set every year. Counties set their own limits, which the state does not control, so the roadside sign is the law on a county road. Interstates stay at full federal weight. Pull SDDOT's current posting map before you haul.

Window, reduction, and where to check

• Season: Any time from February 15 to April 30 (SDCL 32-22-24), posted segment by segment as the roadbed thaws. The window and the posted routes are re-set every year, so last spring's dates don't carry.
• Reduction: A posted tonnage cap, not a flat percentage. SDDOT signs affected highway segments down to a reduced axle limit, commonly 6, 7, or 8 tons per axle depending on the segment. Counties set and post their own limits separately, and those are not determined by the state.
• Interstates: Exempt from the seasonal reduction
• Find the current order: Download SDDOT's current spring-load-restriction posting map at dot.sd.gov, join the SDDOT spring-load email list, and call the county superintendent for local-road limits before you haul.
• Overweight penalty: Standard South Dakota overweight penalty, charged by the pounds over the posted seasonal limit (SDCL ch. 32-22).

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