The short answer
For most visitors staying in Banff townsite, a rental car is optional and often a liability. The townsite is compact and walkable, the main sights are served by shuttles and transit, and parking during peak season is one of the more reliably frustrating parts of a Banff trip. For visitors planning to range widely across the region on their own schedule, particularly outside the busiest months, a car earns its place. The question is less about the destination than about the shape of your itinerary.
Banff townsite is genuinely walkable
This surprises people who expect a mountain destination to be spread out. The townsite is small, and most hotels, restaurants and shops sit within a comfortable walk of each other. Several well-known viewpoints and trailheads are close enough to reach on foot from the centre. If your plan is to base yourself in Banff, eat locally, walk some accessible trails and take in the scenery, you may not use a vehicle for days at a time, and you will still pay for it to sit in a car park.
Local transit and shuttles
Roam public transit serves the townsite and connects to Canmore and to several destinations within the park, and Parks Canada operates shuttle services to some of the busiest sites. Services expand in the summer season and are reduced outside it, so a plan that works easily in July may need more thought in November. Check current routes, seasons and booking requirements directly with the operators when planning, because both schedules and reservation rules change between seasons.
Moraine Lake changed the calculation
This deserves emphasis because it overturns an assumption a lot of visitors still hold. Private vehicle access to Moraine Lake has been removed. Visitors now reach it by Parks Canada shuttle, commercial operator or booked transportation. If seeing Moraine Lake is a reason you were considering a rental, the rental will not get you there. It is the clearest example of a broader pattern: in several of the busiest locations, having your own vehicle no longer confers the access it once did.
Parking, honestly
In peak season, parking in Banff townsite is limited and competitive, and the lakeshore parking at Lake Louise fills early in the day. The practical consequence is that a car does not simply give you freedom; it gives you a new logistical problem to solve every time you want to stop somewhere. Visitors regularly describe circling for parking as one of the more wearing parts of their trip. It is worth weighing against the flexibility a car provides rather than assuming the flexibility is free.
When a car genuinely helps
There are real cases. If you are staying a week or more and want to explore Kananaskis, drive sections of the Icefields Parkway at your own pace, or reach trailheads that shuttles do not serve, a car is the right tool. If you are visiting in shoulder season or winter when shuttle frequency drops, independence is worth more. If you are travelling with a group and equipment and moving between multiple bases, a vehicle simplifies things considerably. The common thread is range and unpredictability rather than simple presence in the park.
The hybrid approach most visitors miss
You do not have to choose once for the whole trip. A common and sensible pattern is to arrive by private transfer from YYC, spend the first days in and around the townsite on foot and by shuttle, and rent a vehicle locally only for the specific days you need one. That avoids paying for a car to sit idle, avoids driving immediately after a flight, and avoids the winter driving question on the one leg where it matters most. Most people never consider it because rental decisions get made at the same moment as flights.
If you skip the car entirely
Getting from Calgary to Banff without a rental is straightforward: shared shuttles, coach services and private transfers all run the corridor. Once you are there, transit and shuttles cover the main destinations, and specific excursions can be booked individually. For a trip to Lake Louise or a day out that shuttles do not serve conveniently, a booked transfer covers the gap without committing you to a vehicle for the whole stay. The result is usually less driving, less parking, and a schedule built around what you want to see rather than where you can leave a car.
Winter changes the answer
In winter the case against driving yourself strengthens for most visitors, particularly those who do not drive in snow at home. Mountain park roads carry seasonal winter tire requirements on fixed calendar dates, conditions change quickly, and closures happen. Shuttle frequency is lower than in summer, so independence is worth more, but the cost of that independence is also higher. If you are visiting in winter and are not confident driving in those conditions, arranging transport rather than a rental is a reasonable decision rather than a cautious one.
How to decide
Look at your itinerary and count how many days genuinely require a vehicle. If the answer is most of them, rent. If the answer is one or two, arrange transport for those days and walk the rest. If the answer is none, which it is for a surprising number of townsite-based trips, skip the car and spend the parking time on something better.