Cassiobury parkrun

Last parkrunday I visited Cassiobury parkrun for the first time. It is one of the last few events I am missing to achieve LonDone+ status and I had been holding it in reserve for a while. It was also the second closest event I had not visited yet, and I had just had a very very tiring week travelling on business.

This week brought both familiar and new to my recent parkrunning. The new is terrain: it feels like I have been parkswimming in mud for a while now and had not the pleasure of a (mostly) fully paved path since my visit to Cyclopark parkrun. And the paths at Cassiobury parkrun felt like newly minted tracks in comparison to recent mud baths.

The familiar is Hertfordshire. I have been coming back to this part of the country quite consistently over the last few weeks: Panshanger parkrun, Stanborough parkrun and Church Mead parkrun are all recent visits. And I loved every one of them, for different reasons.

Anyway, enough with my rumblings. It’s time to dive into some more info about Cassiobury parkrun!

Trip to Cassiobury parkrun and parking

Cassiobury Park is the main city park in Watford, North West of London and still within the inner area of the M25. As such, Cassiobury parkrun is one of the event included in the LonDone+ challenge and public transport options still somewhat benefit from the extensive TFL network.

This even has decided to have a meeting point a short walk away from the actual start line. The meeting point is right by the bandstand, in the Western part of this large green area. Direct access to the bandstand can be found from Shepherds Road and Stratford Road.

According to the official event site, if you want to come by public transport, you could use the London Underground. Watford Underground Station is served by the Metropolitan Line, connecting to Baker Street among others. Since this is very much an out of town station, it is recommended to check live travel information in the morning. Services to Watford are not as frequent as inner town ones and engineering works tend to happen during the weekend. Go figure, TFL and their backwards priorities, looking after work days more than parkrunday. If you manage to get there on time, the station is about 400m walk away from Cassiobury parkrun meeting point.

Since not everyone comes from Central London and we Londoners should realise there is a world beyond the M25, there are also mainline train stations that can get you to Cassiobury parkrun. Watford Junction station is served both by the London Underground and National Rail services, with connections to Milton Keynes.

If you are driving, Cassiobury Park is fairly close to the M25, so relatively easy to reach from London, the South East or the East. The official event site does not mention any car park within the park and seems to discourage parkrunners from coming by car. I think this is probably because this is a busy event and if everyone used the park main car park, it could easily get overwhelmed. I have, however, tried my luck and set my Waze navigator towards Cassiobury Park car park. This is a sizeable car park accessed from the South, with just shy of 300 parking bays. You can pay using the RingGo app and when I got there around 8:30 it was still about 2/3 empty.

From the car park, you need to cross a large field and the walk to the meeting point will take about 5 minutes at a brisk pace. There are no signs to point at the event meeting point from the car park.

Cassiobury parkrun: start and briefings

As you reach the car park, you will see a cafe on a little hill North of where you are. Walk towards it and lean right, towards a higher ground exit from the car park getting you onto a large field. Cross the field heading East, leaving the hill cafe behind you. Once you have nearly fully crossed the field, head left and you should see the bandstand after a small line of trees.

The meeting point by the bandstand is in a nice, wide clearing surrounded by trees. I guess this offers cover from sun in summer and wind and rain in winter. On the day of my visit, it was just plain grey, so not much to be protected from. It is also within sight of another cafe. I did not explore that area, so not sure if services were available there before the event.

I was there around 8:45, but I did not notice if a First Timers Briefing was held. When it is time to start, the team invites everyone to start walking towards the start line, on an open field a couple of 100 metres away.

Once everyone reaches the start line, things will look less busy than they are because people can set up on a very wide open start. The RD started giving her briefing with a good sound system and eventually it was time to check everyone was ready to go.

After a short countdown, the time came. Parkrun.

Cassiobury parkrun course review – star ratings

Cassiobury parkrun course review – route highlights

There were 580 parkrunners on the day of my visit to Cassiobury parkrun. It was a grey day, but it was slightly less cold than recent weeks and, most importantly, parkrunday was coming from a less rainy week than most of the previous parkrundays in 2026. A field of 580 parkrunners is roughly in the bottom half of attendance levels Cassiobury parkrun seem to experience. I can see fairly consistent attendance in a 550 to 700 range. With an exciting peak of 889 for the Christmas 2025 special event. That must have been a party! The event can manage with very large fields at the start, I think even Bushy-level busy would work there. However, when people converge on the paths, it will be a different story. Around 600 it already felt busy, so I think current attendance level are indeed hitting the sweet spot.

Congestion was not a problem at the start because of the wide, open line up. The turn leading onto the paths was also pretty comfortable because it can be taken over a pretty wide area. Once on the paths, however, it did start to feel busy and it felt busy for the whole first 1k-long straight. Not unpleasant busy, but I-can-smell-your-sweat busy. Good there were plenty of daffodils in full bloom. 🙂

Surface-wise, the start and finish funnel are on grass. It was slightly muddy, but after the mud baths I have been enjoying over the last few weeks, t was barely noticeable. At least relatively speaking. The rest of the course is on paved paths and they are very well maintained. I sported my road shoes again after a few weeks and did enjoy the run without any issues whatsoever. This can be a fast course, if you are in good shape and want to go for it. The course configuration and surface reminded me of Tooting parkrun, which had been my PB course for a while. If you are familiar, I think Cassiobury is faster, because turns are usually significantly less tight.

Elevation-wise, at 33m elevation gain over 2.5 laps, Cassiobury parkrun is an interesting course. It is essentially flat, but it mostly doesn’t feel flat. I had the weird feeling that most of it was slightly downhill, and felt gravity helping me on most segments. It took me a bit to realise that the first straight is a long, slight uphill, which is obviously needed to gift you the downhill feeling on the other 2 segments.

In terms of course layout, it is a triangle. Two long laps and a short one, with the finish funnel coming half way through the third lap along the second long segment.

A quick Relive route plot is on my YouTube Channel, with longer video highlights embedded below.

At the get go, you are running through a large field, on a slight uphill I barely noticed because of start line thrills. It is on grass and on the day I visited it was a bit squishy, but not terribly muddy. However, I’ve read reviews saying it can get extremely muddy and I don’t struggle to believe it. You are running back towards the bandstand and it’s less than a minute before you approach the paved paths you had crossed to walk to the start line. To converge onto the path it is a wide right turn with people taking it at different spots, so it does not turn into a bottleneck.

Once you are on the path, you are starting the first long straight line on the course. It is wide enough not to feel too busy, but at least on the first lap it felt busy all the way to the end. And it is about 1K long. I tried overtaking off path a few times and it was muddy and slippery there. Also, in some areas you don’t want to get off the path because of the beautiful planted verges. This bit is slightly uphill, but it did not feel uphill to me.

At the end of this straight, one wide 120-degrees turn on the inside of a small planted roundabout and you are on straight number 2. You are now running back towards home, on a wider angle. The path continues being sided by flowers and mature trees and surface is still great. Here, you do feel a slight downhill, which is great on your legs. Half way through this straight you pass by the finish line, with plenty of volunteers and the finish funnel on your left. Force yourself not to turn twice, you will only be able to do that on your third approach.

After you have left the funnel on your back, you must keep going on a a prolongation of this straight. It’s not going to be long before you reach the next corner, where you have another wide left turn getting you onte the last segment making up the Cassiobury triangle. This segment is shorter. Half way through it you pass the point where you had merged onto the path from the open start, then you pass bay some buildings and eventually converge again on the initial straight.

Run the whole thing once more and then start lap number 3. This however will only be a half lap. Once you get on the second long straight, you already know where the finish funnel will be. And this time you can head left off the path and run a few metres on grass to reach the finish funnel.

Congratulations on completing Cassiobury parkrun!

Facilities at Cassiobury parkrun

Cassiobury Park is not only a large, beautiful green area, but it also offers a nice spread of interesting facilities. The area around the ‘hilltop’ cafe near the car park offers a large children play area and a nice stream with swans, while there is also a sizeable cafe near the bandstand.

I did not check the toilet situation next to the bandstand, but toilets are available at the cafe near the car park.

As a competitor to the McDonald’s index, I am continuing to collect data for the parkbreakfast index: how much is breakfast at each location?

At Cassiobury parkrun, I ordered a San Pellegrino lemon soda, a rocky brownie and a single espresso. This cost me around £8.

Cassiobury parkrun: Video Highlights

As usual, I’ve taken a few video snippets during the run to give an idea of the course. If you like it, please subscribe, it’s a fun past time for me 🙂

The other parkrun videos on my YouTube channel are all linked on the course review and video highlights summary page.

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Achievements and performance

Conclusions

This is a nice, busy, local event in a glorious park. The course is not one that you will tell stories about, but I have no doubt it comes into his own beautifully in spring and summer. I enjoyed my visit a lot, with the team being wonderfully welcoming and the park offering many interesting corners to relax after the event.

I would love to visit again with good weather to experience it in a different way. Maybe I will, who knows.

Finally, obviously, thank you, Cassiobury parkrun team for your hospitality!