Alaska Frost Laws & Spring Thaw Limits

Alaska cuts hard for breakup. DOT&PF posts limits as a percentage of legal axle weight: 85, 75, or 50 percent, so up to a 50 percent cut, with the steering axle never below 100 percent (17 AAC 25.013). The window runs roughly late February into June, set by region and frost depth. Unlike the Lower 48, Alaska restricts its main highways, so the Parks and Glenn aren't exempt. Check DOT&PF's MS/CVC restriction page before each trip.

Frost lawsYes

Typical windowBy region, roughly late February through June, set each year by frost depth and thaw

ReductionStated as a percentage of legal allowable axle weight: 85%, 75%, or 50%, so up to a 50% cut of gross on the worst roads

InterstatesCheck routes

Check the current order. Alaska's thaw restriction is declared fresh each spring and posted per road, so the dates and limits below describe the pattern, not today's order. Alaska DOT&PF Measurement Standards & Commercial Vehicle Compliance (MS/CVC) weight-restriction page (dot.alaska.gov/mscvc). Sign up for email/text restriction alerts and check the regional public notices before each trip.

01 The rule

How Alaska handles spring thaw

02 The details

Window, reduction, and where to check

Season: By region, roughly late February through June, set each year by frost depth and thaw. Southeast lifts earliest; the Interior can run into late June. Declared and lifted per region.
Reduction: Stated as a percentage of legal allowable axle weight: 85%, 75%, or 50%, so up to a 50% cut of gross on the worst roads. The steering axle is never cut below 100%.
Interstates: Check the posted routes
Find the current order: Alaska DOT&PF Measurement Standards & Commercial Vehicle Compliance (MS/CVC) weight-restriction page (dot.alaska.gov/mscvc). Sign up for email/text restriction alerts and check the regional public notices before each trip.
Overweight penalty: Standard Alaska overweight penalty, charged per pound over the reduced limit (17 AAC 25 / AS 19.10).

Alaska Frost Law FAQ

Does Alaska have frost laws?

Yes. Alaska posts seasonal spring-thaw weight restrictions. Alaska cuts hard for breakup.

When are Alaska's spring weight restrictions in effect?

By region, roughly late February through June, set each year by frost depth and thaw. Southeast lifts earliest; the Interior can run into late June. Declared and lifted per region.

How much do the limits drop in Alaska?

Stated as a percentage of legal allowable axle weight: 85%, 75%, or 50%, so up to a 50% cut of gross on the worst roads. The steering axle is never cut below 100%.

Do Alaska's frost laws apply to the Interstates?

Alaska applies restrictions beyond the usual state and local roads — check the posted routes.

Reference information for planning, not legal advice. Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it. Last reviewed July 2026. Source: https://dot.alaska.gov/mscvc/pages/weightrestrictions.shtml. See our Terms & Disclaimer.

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Alaska Frost Laws & Spring Thaw Limits

How Alaska handles spring thaw

Window, reduction, and where to check

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