Every spring Manitoba’s highway network thaws from the south up, and Manitoba Infrastructure responds by capping axle weights on the roads most vulnerable to soft-base damage. For a regional carrier or an owner-operator, that three-month window is the part of the year where margin disappears the fastest. The drivers who plan for it well end up running close to a normal schedule. The ones who do not lose loads, burn equipment, and discover gaps in their coverage at the worst possible time.
What spring restrictions actually are
Manitoba’s Spring Road Restrictions program is the province’s way of protecting roadbeds while the frost works its way out of the subgrade. Saturated soil loses bearing capacity in spring, and a fully loaded tractor-trailer crossing it does several months’ worth of damage in a single trip. The fix is to lower the legal axle weight for a defined window each year, by climate zone, and by road class.
Manitoba Infrastructure publishes the restriction map at the end of winter — the exact dates shift a week or two depending on how the thaw is unfolding. The 2026 program runs across the same five climate zones the province has always used, with the southernmost zone starting first and the northern zones starting last.
Climate zones and start dates
| Climate zone | 2026 start date | Where it covers |
|---|---|---|
| Zone 1 | March 1 | Southern Manitoba (US border up to ~Winnipeg) |
| Zone 2 | March 6 | Greater Winnipeg and capital region |
| Zone 3 | March 6 | Interlake and Eastman |
| Zone 4 | March 6 | Westman and the Parkland |
| Zone 5 | March 12 | Northern Manitoba |
End dates are not fixed in advance. The province releases each zone in rolling order as the roadbed dries — usually somewhere between May 29 and June 10 — and lifts restrictions earlier or later if the season is unusual. Plan your June commitments with a one-week buffer either way.
The 65% and 90% axle weight rules
Restrictions are applied by road class, not uniformly. The most vulnerable roads — typically lighter rural and Class A1 routes — drop to 65% of the normal legal axle weight. Heavier-built routes, including most B1 highways and the RTAC-rated arterial network, stay at 90%. Major routes designated as all-weather generally remain at 100% even during restriction season.
For an operator, that means you cannot just look at the calendar — you have to look at the specific route the load travels. A run from a gravel pit on a Class A1 secondary road is a very different math problem from a run between Winnipeg and Brandon on the Trans-Canada.
- 65% routes — Plan loads at roughly two-thirds of your usual axle weight. For most tandem-drive tractors, that is the difference between a full load and a partial.
- 90% routes — Closer to normal, but still enough of a cut that you cannot just ignore it on heavy loads. Most fleets handle this with minor route or load tweaks.
- All-weather routes — No restriction. If your run can stay on the all-weather network end to end, you may not need to adjust at all. Worth mapping in advance.
The fleets that survive restriction season well are the ones that move the planning upstream — they have routes mapped and loads sized before Zone 1 opens, not after.
Where your insurance fits in
Spring is also when commercial trucking insurance gets tested. A lighter load on a soft road does not eliminate risk — in some ways it increases it. Drivers compensate for the lost revenue by running more trips, more hours, and tighter schedules. Equipment that has been idle through the worst of winter comes back online without a proper pre-season inspection. Claim frequency goes up.
Three coverages worth reviewing before March 1
- Motor Truck Cargo. Limits and exclusions vary widely. If you have changed commodities, added refrigerated loads, or started hauling for a new shipper, the policy that fit last fall may not fit now.
- Downtime / loss of use. A truck off the road for two weeks in May costs the same as it does in November, but cash flow is tighter in spring. Confirm what your policy actually pays for a covered loss and how long the elimination period is.
- MPI SRE and private liability. If you run Special Risk Extension on the MPI side, make sure your radius, vehicle list and declared commodities match what you actually do. Mis-declared radius is one of the most common reasons a commercial claim runs into trouble.
A four-week pre-thaw plan
If you operate even a small fleet in Manitoba, the four weeks before Zone 1 opens are the highest-leverage window of your year. A practical checklist:
- Week one — Routes. Pull every standing route on paper and mark which segments fall into 65% vs 90% vs all-weather. Identify the ones with no flexible alternative.
- Week two — Loads. For routes with no alternative, calculate the legal load at 65% or 90% and price it against your customer rate. Have the conversation with the shipper now, not in April.
- Week three — Equipment. Spring inspections, brake checks, suspension. Lighter axle weights mean more axles or more trips — both increase wear, and both put pressure on the truck.
- Week four — Coverage. Sit down with your broker. Walk the policy. Confirm cargo limits, radius, vehicle schedule, and any commodity exclusions. Fix anything that does not match how you actually run.
How a commercial broker helps
On the personal auto side, MPI is uniform and broker choice has limited impact on price. Commercial trucking is the opposite — every carrier underwrites differently, every policy has its own definitions of cargo and radius, and the wrong answer can leave a six-figure load uninsured. Working with a broker who specializes in commercial fleets is not optional in this market. It is the cheapest insurance you will buy all year.
At Galaxy we work with the major Canadian commercial carriers and place fleets across Manitoba, Saskatchewan and Ontario. If your policy needs a tune-up before the thaw, we will tell you. If it does not, we will tell you that too.
