EV Winter Range in Canada: The CAA Numbers, the Short-Trip Penalty, and the Two Kinds of Preconditioning

Electric vehicles · 8 min read

Published November 4, 2026 · Last updated November 4, 2026

14 to 39 percent. That is the spread the Canadian Automobile Association measured when it drove popular electric vehicles from Ottawa toward Mont Tremblant in February 2025, at temperatures between -7°C and -15°C, and kept driving until each battery was empty. Every result was compared against the official range Natural Resources Canada publishes for that model. The same test is the source of most winter range numbers quoted in Canada, and it is a highway test. What it does not show is the trip most Canadian EVs actually make in winter: the short one, repeated, with the cabin reheated from cold every time. That trip costs more, and the controlled testing that proves it is quoted far less often.

The CAA test, with the conditions attached

CAA clubs from across the country ran the test with 13 EV models representing more than two-thirds of Canadian EV sales. Two vehicles started below a full charge, the Chevrolet Silverado EV at 73 percent and the Ford F-150 Lightning at 89 percent, and CAA adjusted its calculations for both. Keep those conditions in mind when a single percentage gets quoted without them. Selected results, as CAA published them:

Two cautions belong with any table like this. First, the percentages are not a property of the badge. They are one test, on one route, in one temperature band. Second, the charging column is not a smaller version of the range column. The test Hyundai IONIQ 5 added only 64 km in its 15 minutes, at an average of 80 kW, while the Model 3 added 205 km, and its test ran at 150 kW through an adapter while the other cars used 350 kW chargers. A car that keeps its range well can still charge slowly in the cold, and the planning fix for each problem is different. An NRCan EV expert puts the general figure at 25 to 30 percent of range lost in extreme cold, and notes that Canadians drive 60 km or less a day, against an average EV range of up to 450 km. For daily driving, the loss is mostly an inconvenience. For a winter highway trip, it is the plan.

The short-trip penalty the highway test hides

Controlled testing by Transport Canada separates what a road test cannot. Driving at -7°C reduced range by about 20 percent compared with 20°C, before cabin heat entered the picture. Running maximum cabin heat at -7°C cost roughly another 25 percent against the heat-off run at the same temperature. At -18°C to -20°C with maximum cabin heat, the total reduction reached roughly 55 to 60 percent against the mild weather baseline.

The mechanism matters more than the headline. A gasoline engine heats its cabin with waste heat. An EV generates cabin heat from stored electricity, on top of the cold battery's own efficiency loss, the power its thermal management spends warming the pack, weaker regenerative braking while the pack is cold, and the extra drag of dense winter air and slush. On a long drive the cabin is heated once and then maintained. On a 15 minute trip, the cabin is heated from cold, the pack never fully warms, and then the car sits and cools again. The next trip pays the warm-up cost a second time. Reporting on the Transport Canada figures puts it plainly: on short trips, the energy used to heat the cabin can rival the energy used to move the car. Hardware softens this, up to a point. A heat pump usually reduces heating demand compared with resistance heating, though the advantage narrows at very low temperatures.

Two kinds of preconditioning, two different jobs

Most winter EV advice says to precondition, as if it were one action. It is two, with different triggers, and Tesla's official cold weather documentation is the clearest place to see them separated.

Departure preconditioning warms the cabin and the battery before you leave, while the car is still plugged in. Tesla's documentation stresses the plugged-in part: preconditioning on external power draws from the supply rather than the battery, which maximises the energy available for driving once you unplug. The schedule is set from the touchscreen (Controls, then Schedule, then Precondition) or in the app, and scheduling the charge itself to finish close to departure reduces the energy needed to warm the battery afterward. The Model Y manual recommends activating climate settings at least 30 to 45 minutes before departure. Menus and names differ by brand; the principle, warm it on grid power, does not.

Charger preconditioning warms the battery on the way to a fast charger, so it can accept charge at speed on arrival. Heating a battery for fast charging takes longer from colder temperatures, which is why the trigger is navigation: Tesla's Trip Planner preheats the battery as the car approaches a Supercharger, and the manual recommends navigating to the charging location for at least 30 to 45 minutes before arrival where the drive allows. Reporting on the CAA test gives the same advice generically: use the car's built-in route planner to reach the charger, arrive at a lower state of charge, and prefer one longer stop over two short ones, because the pack stays warm. The 15 minute charging spread in the CAA table above is what is at stake.

The cold morning routine

1. Leave the car plugged in overnight in deep cold. Tesla's guidance recommends staying plugged in well below freezing to keep the battery warm, noting the car may draw more power to charge than a standard household outlet can provide in those conditions.
2. Set the departure schedule the night before. Charge timed to finish near departure, cabin and battery preconditioning on external power, 30 to 45 minutes of lead time on the coldest mornings.
3. Clear all snow off the car before leaving. CAA calls out the aerodynamic cost of carrying it, on top of the usual safety reasons.
4. Heat yourself before the whole cabin. Seat and steering wheel heaters first. Tesla's manual states seat heaters use less energy than the cabin heater, and CAA's tips say the same.
5. Drive gently for the first 10 to 15 minutes. CAA's guidance, and it matches the hardware: regenerative braking is limited while the battery is cold and returns as the pack warms.
6. On a road trip, navigate to the charger in the car's own planner. That is what starts charger preconditioning. Arrive at a lower charge, and take one longer stop rather than two short ones.

What success looks like: the cabin is warm at departure with the charge level where you left it, the car's displayed estimate tracks your plan instead of falling away in the first half hour, and a fast charge stop adds range at something like the pace the CAA test recorded for your model, not at a cold pack crawl.

Planning the trip: an arrival buffer, not a hope

The planning method in the reporting on the CAA test is arithmetic, not optimism. Start with the published range. Multiply by 0.75 for a conservative winter estimate. Take off another 5 to 10 percent if the roads are snowy or the winds are strong. Then plan charging stops to arrive with 10 to 20 percent remaining. A worked example, using the average figure from NRCan's guidance: a car rated at 450 km plans as roughly 338 km on a calm cold day, and closer to 305 km in snow and wind, with stops set so it never needs the last tenth of the pack to reach one.

That last tenth deserves its own warning. CAA found that indicated zero percent is not a standard reserve. On the test, the Model 3 ran 25 km on an indicated zero percent, the IONIQ 5 managed a short distance at zero, and the F-150 Lightning showed no reduced power warning and stopped the moment it reached zero. There is no way to know which behaviour your car has until it demonstrates it, which makes zero a place to have already left, not a buffer to spend. In CAA's ownership survey, more than 65 percent of Canadian EV owners reported lower range in extreme cold, and four in ten called significantly slower winter charging a problem. Neither fact is a reason to avoid an EV in Canada. Both are reasons to plan with the test numbers instead of the brochure number, and to let preconditioning, both kinds, do the work it is documented to do.

— Owen Park, Automotive Writer