Cathedral Grove: The Highway 4 Old-Growth Stop

H.R. MacMillan's 1944 Gift

The park exists because H.R. MacMillan, a forester and timber businessman, donated 136 hectares of old-growth forest to the province in 1944, according to BC Parks' own page for MacMillan Park. The grove itself carried the name Cathedral Grove from the 1920s, a name reportedly coined by Governor General Viscount Willingdon in 1928. Three years after the donation, the province formally established MacMillan Provincial Park as a Class A provincial park in 1947.

The idea was to protect a sample of the huge Douglas fir forest that once covered much of this part of the Island, and to let the public walk into it rather than view it from a logging road. It worked. In the 2017-18 reporting year BC Parks recorded 543,735 visits, which makes this short stretch of highway one of the busiest natural stops on Vancouver Island.

The Trees

The headline trees are Douglas firs, and some of them are more than 800 years old. The largest specimen in the grove measures more than 9 metres in circumference, which is about 30 ft around the trunk. To put that in perspective, a single trunk is wider than most parking spaces are long.

The trees stand on both the north and the south sides of Highway 4, so you do not need to pick one side to see the best of it. The forest here is the kind that once dominated the Cameron River valley, and standing at the base of a fir that predates European contact on this coast is the reason roughly half a million people pull over each year.

How Big The Park Actually Is

There is an honest discrepancy in the published figures. BC Parks states that H.R. MacMillan donated 136 hectares in 1944, and that is the founding gift. Wikipedia gives the park's current total size as 301 hectares (740 acres), with the old-growth Cathedral Grove portion at 157 hectares (390 acres).

The current figures are larger than the 1944 donation, most likely because of later additions to the park, but our sources do not explain the difference, so we print both rather than quietly choosing one. What matters for a visitor is simpler: the grove is bigger than the roadside strip you can see from the car, and the trails on both sides of the highway only cover a fraction of it.

Highway 4 runs directly through MacMillan Provincial Park and splits it into a north side and a south side. You park on the shoulder, walk in, and then cross the road on foot if you want to see both sides. BC Parks does not publish trail lengths for the paths here (sometimes labelled the Old Growth Trail or Living Forest Trail), so we will not invent distances.

What can be said is that they are short, well-marked loops that most able visitors walk comfortably, and some sections are accessible. The south side is the busier side and holds the main viewing area beside the biggest firs, with a hard-surfaced path and a viewing platform near the Cameron River. The north side is usually quieter and has a more natural forest-floor feel.

The full loop-plus-crossing visit typically fits inside half an hour, though photographers and families often linger longer. Watch the traffic when you cross: this is a working highway with tour buses and logging trucks, and the same narrow shoulder you parked on is the road edge they are using.

Cathedral Grove is not permanently closed, but it does close, and there is a clear reason. The old firs are shallow-rooted and vulnerable to wind, so BC Parks warns visitors to stay off the trails on windy days because of the risk of falling branches and whole trees. Storms have done real damage here: a severe windstorm in December 2018 and another in November 2024 both caused storm damage and tree loss in the grove, and some trail sections have been closed after storms while the hazard trees are dealt with. So if you arrive and find a gate or barrier, it is almost always a wind or storm-safety closure rather than a permanent one. The practical advice: check the BC Parks MacMillan Park page on the morning of your drive, skip the stop if the trees are being thrown around, and try again on a calmer day. On a still morning the risk is low and the forest is at its best anyway.

The underlying reason these old trees are so vulnerable is the same reason they are worth seeing at all. A tree that has stood for more than 800 years has usually grown to a height and canopy weight that a young, flexible tree does not carry, and its root system, however wide, is still shallow relative to that height, since Douglas fir on this coast tends to root in a relatively thin layer of soil over rock and compacted glacial till. That combination, tall and heavy above, shallow below, is exactly what a strong coastal windstorm exploits. It is also why BC Parks treats wind risk here differently from a typical hiking trail: this is a grove of genuinely old, genuinely large individual trees rather than a younger, denser forest that flexes and sheds smaller branches instead of whole trunks. None of that should put off a visit on a calm day. It simply explains why the same forest that draws half a million visitors a year is also the one BC Parks is most cautious about in a storm.

Match your stop to the time you actually have. The south side alone covers the biggest and best-known trees, so it is the one to prioritise if you are on a tight schedule.

Parking On A Narrow Highway Shoulder

There is no dedicated visitor lot with a stated number of spaces. Parking has historically run along both narrow shoulders of Highway 4 near the Cameron River bridge, an arrangement BC Parks and other observers describe as unsafe given the mix of tour buses, logging trucks and regular highway traffic using the same road. In practice this means the busiest hours of a summer day can leave you parking further from the entrance than you would like, or waiting for a gap in traffic to cross safely on foot even before you reach a trail.

Arrive earlier in the day if you can choose your timing, and treat the walk from your car to the trailhead as part of the visit, not a formality, since you are sharing the shoulder with moving vehicles.

What Is And Is Not There

This is a day-use stop, not a visitor centre with services. No camping is offered in the park, and our sources do not confirm washrooms, a gift shop or an interpretive centre, so do not plan around any of those being available. What is confirmed is a hard-surfaced path section and a viewing platform on the south side near the Cameron River, which gives an easier, more level walk than a typical forest trail and puts you close to some of the largest firs without a long approach.

Smoking is prohibited throughout the park, which matters given how dry the forest floor can get in summer despite the shade.

Photographing The Grove

The forest canopy here is dense enough that direct midday sun creates harsh, high-contrast light down at ground level, a common problem in old-growth photography generally. An overcast day, common on this stretch of coast, actually produces more even, usable light for photographs of the trunks and canopy than a clear blue-sky afternoon does. Bring a wide lens if you have one: the trees are close together and wide enough in circumference that stepping back far enough to fit an entire trunk in frame is not always possible from the trail.

Because the site is essentially a roadside pull-off, morning light before the day's traffic and crowds build is also the quietest window for photography without other visitors in every frame.