Forty minutes, give or take, is all you need to do Zig Zag Scenic Drive properly if you treat it as a driving loop with your boots staying in the boot. But that's the wrong way to do it. The road itself is the least interesting part of the day; it's the five or six pull-offs along the old railway alignment that are worth the actual walking, and most of them run somewhere between 15 and 40 minutes return, nothing that needs more than a full water bottle and the runners you already had on.
I did the full run of stops on a Tuesday morning in old trail runners rather than boots, no gaiters, one 750ml bottle that I refilled at the Kalamunda townsite before starting. That's the giveaway right there — this isn't a walk that demands kit. If you're gearing up like you're heading onto a Bibbulmun Track section, you've overpacked.
What Zig Zag Scenic Drive actually is
The road follows the old Zig Zag Railway alignment that used to haul timber and produce down the escarpment from Kalamunda, and the switchbacks that give the drive its name are the same grade the old rail line needed to manage the drop. It's steep enough that the road itself does more work than most of the walks off it, which tells you something about the terrain before you've even parked.
It sits within the broader Perth Hills escarpment country, and most of the reserve land either side of the road is managed under the usual WA Dept. of Biodiversity, Conservation and Attractions framework, so expect the standard fire-season track closures in high-risk months. Worth checking before you drive out on a total fire ban day, because some of the smaller spur trails do get shut without much fanfare.
The lookouts that earn the stop
Gooseberry Hill Lookout is the one everyone's seen on a phone screen at some point, usually at sunset with the Perth skyline glowing in the haze, and it's popular for a reason. The walk in from the car park is barely five minutes on a sealed path, which makes it accessible to almost anyone, but I'll say the mildly unpopular thing here: it's not actually the best view on the drive, it's just the easiest one to get a photo at. If you've only got time for one stop, it shouldn't be this one.
Further along, there's a short unmarked track off one of the wider pull-offs that drops you onto a rock shelf with a clearer sightline down the scarp face, no barrier, no interpretive sign, just a flat granite slab and the wind. It's maybe 12 minutes return and it does more for the legs and the eyes than the marked lookout does, in my opinion, though I'll admit it's the kind of spot that's easy to walk straight past if you don't already know it's there.
Where the short walks connect to bigger days
None of the Zig Zag stops are destinations on their own if you're after a proper day out, but they sit close enough to real walking country that it's worth planning a loop around them rather than just the drive-through version. Kalamunda Circuit picks up not far from the top of the zig zag and gives you a proper few hours on foot through jarrah and marri forest, and it's the walk I'd point most people toward if the lookouts alone feel too short for the trip out.
If you want to go further than that, the Bibbulmun Hiking Experience Kalamunda to Mundaring tour runs through the same general country and gives you a guided version of terrain that, honestly, is a decent step up in difficulty from anything off Zig Zag Scenic Drive. I use the Bibbulmun as my own yardstick for grading most Perth Hills walks, and by that measure the zig zag stops sit somewhere around the easiest sections near Kalamunda itself, nothing that would trouble anyone who's done even a short stretch of the real track.
For families weighing up which end of the hills to base a day around, our piece on Kalamunda or Mundaring: which Perth Hills start point wins is worth reading before you commit, since it changes which stops along Zig Zag Scenic Drive make sense as a start or finish point.
A detour worth the extra ten minutes
If you're driving out from the city rather than starting in Kalamunda proper, it's a small diversion to swing past Advent Park in Maida Vale on the way up, particularly if you've got kids who need to burn off the drive before you ask them to walk anywhere. It's not on the scenic drive itself, but it sits close enough on the route in from the city that it makes sense as a warm-up stop, flat ground, shade, nothing technical.
What I carried, and what I didn't need
One water bottle covered the whole morning across five stops, and I didn't touch the second one I'd packed in the car. No gaiters, no need for them on any of the marked paths, though the unmarked rock shelf detour would want proper grip in wet weather rather than the trail runners I had on. I did misjudge one turn-off near the third pull-off and walked about four minutes down what turned out to be a fire access track before doubling back, which cost me nothing but a slightly annoyed look from a magpie.
The whole run of stops, done properly with time to actually stand at each lookout rather than just glance and go, took me just under two hours including the drive time between them. That's a fair morning out without needing to plan meals or spare layers, though I'd still throw a light jacket in the car between May and September, the wind funnels through some of those cuttings and it's colder up top than the Kalamunda car park would suggest.
Checking before you go
Track conditions and closures around the scarp change more often than people expect, especially after a wet winter when erosion takes out sections of the smaller unmarked paths. Trails WA keeps reasonably current listings for the formal walks in this pocket of the hills, and it's a better first check than assuming last year's blog post still describes the track accurately.
None of this is a hard walk by any measure, and it was never going to be, but that's rather the point of Zig Zag Scenic Drive. It's not a destination for people chasing distance or elevation gain, it's a string of short, easy stops that reward slowing the car down more than they reward any particular fitness. Skip the crowded lookout if you're short on time, and give the quiet rock shelf the ten minutes instead.