Why Slieve Donard's lower paths are worth the drive, even in February
Everyone pictures Slieve Donard as the summit scramble, the one with the Mourne Wall and the view across to Scotland on a clear day. But most dog owners never go near the top, and in the wet months you shouldn't try. The real draw for dog walks in the Mourne Mountains, County Down, is the lower ground around the Glen River and Donard Park in Newcastle — forested, river-fed, sheltered from the worst of the wind, and genuinely one of the best stretches of dog-friendly walking in the whole of County Down.
In January and February this ground is a different animal to the dry, dusty paths of a July afternoon. The granite underfoot turns glassy when wet, the Glen River rises and spreads across sections of the track, and the mud at the lower, flatter stretches near the car park can be ankle-deep after a few days of rain — which, this being County Down, is most weeks. None of that makes it a bad walk. It makes it a different one, and it rewards a bit of preparation.
Where to park and which entrance is quieter
The obvious start point is Donard Car Park at the bottom of Donard Park in Newcastle, right where the Glen River path begins. It's well used year-round and gets busy on dry weekends, but in heavy winter rain the crowds thin out considerably — you'll often have long stretches of the lower path to yourself on a wet Tuesday morning. There's usually parking near the main entrance, though it can fill on better days even in winter, so have a second plan.
That second plan, for a quieter wet-weather walk, is Bloody Bridge car park a little further south along the coast road (the A2) out of Newcastle. It gives access to a different stretch of lower Mourne ground along the Bloody Bridge River rather than the Glen River, with less footfall and fewer other dogs to negotiate on a narrow, muddy path. It's rougher underfoot in places and the river crossing there needs more care after rain, so it suits a steadier dog rather than a nervous or very young one.
What the ground is actually like in the wet months
The lower Glen River path is mostly stone pitching and old granite slabs, laid down over the years to stop the route eroding further, with some sections of duckboard across the boggier ground nearer the Ice House. In dry weather this surface is sure-footed and dog-friendly. In the wet months the slabs get a film of algae and the duckboards become genuinely slippery — more than one owner has gone down on their backside on the Ice House boardwalk in a January downpour, dog included.
Drainage on the lower trail is decent by Mourne standards, since the stone pitching does shift water off the main line of the path, but it can't keep up with sustained rain. After two or three wet days you'll find standing water pooling at the low points, and the river itself widens across parts of the path where it normally sits well below the bank. Dogs who like to drink from running water should be kept an eye on here — after heavy rain the Glen River picks up sediment and runs fast and brown, and it's not somewhere you want a dog wading in past its knees.
Lower down near the car park, where the ground is flatter and less stone-pitched, the mud is the ordinary soft, clinging kind — the sort that cakes a dog's underside and gets flicked up the back of your trousers. It's not treacherous, just relentless. Further up, before the path starts to climb properly towards the Mourne Wall, there are a couple of short, steeper rocky sections that turn genuinely hazardous when wet and are best treated as the turnaround point for a dog walk rather than a through route in winter.
The kit that actually makes a difference
None of this is about turning a dog walk into an expedition — it's about not dreading it. A few things consistently earn their place in the car boot for anyone doing dog walks near Belfast and down into the Mournes through the winter.
A harness beats a flat collar hands down on the slabs and duckboards, because a sudden slip is far easier to correct with a handle on the back than a collar at the throat. A second, spare lead is worth keeping in the car — wet clips rust and sticky mud finds its way into every mechanism eventually. For your own feet, proper walking boots rather than wellies make the steeper, loose sections much safer, since wellies give you no ankle support on the slabs.
- A well-fitting harness with a solid handle, for control on slippery granite
- An old towel or two, plus a microfibre one for the dog's belly and paws before they get back in the car
- A dog coat for thin-coated breeds — the wind funnels down the glen and the wet cuts through fast
- Paw balm if you're walking regularly through grit, salt, or sharp winter mud
- A change of socks and a bin bag for muddy kit, kept permanently in the car between October and April
Getting there without losing the morning to traffic
Coming from Belfast, most people take the A24 down through Carryduff and on towards Ballynahinch before picking up the A25 into Newcastle, or run the A24/A1 to Saintfield and across. On a wet winter Saturday this road can slow down badly, particularly once you're through Ballynahinch, as everyone else has had the same idea about getting a dog out before the next band of rain arrives. A weekday morning, or an early start at the weekend, buys you both a quieter car park and a drier path, since the worst of the rain in County Down tends to build through the afternoon.
If you're coming from the Carryduff or Newtownbreda side of Belfast, it's worth factoring that extra bit of driving into the shape of your day — a lower Mourne walk is not a quick lunchtime outing the way Cregagh Glen or Clandeboye might be. It's a half-day trip once you include the drive, the walk, and the clean-up afterwards, which is exactly why so many owners treat it as a weekend ritual rather than a daily one.
What to do with a soaked, filthy dog afterwards
However careful you are, a lower Mourne walk in the wet months ends with a dog that is wet through, muddy to the shoulder, and extremely pleased with itself. Towel off as much as you can at the car before anyone gets in, and if your dog will tolerate it, a quick rinse of the paws and belly with a bottle of clean water saves your upholstery and stops them tracking river silt through the house.
If you're heading back into Belfast and know you won't be home for a while, or you've got a weekend away planned and need somewhere for the dog while you're at it, it's worth having a plan for dog boarding or doggy day care near you sorted in advance rather than scrambling on the day — kennels and home-style boarding both get booked up fast around school holidays. We see plenty of dogs through Johnny's Doggy Hotel in Carryduff who've clearly just come off a Mourne walk, and a warm bath and a proper dry-off is usually the first thing on their mind too.