On most Tuesdays, Martial Cottle Park looks like what it is: a flat, paved loop off Snell Avenue where people run before work, walk a dog before dinner, or push a stroller because the trail never climbs. On Saturday, October 3, 2026, that same ground gets a pumpkin patch, antique tractors, food trucks, and a stage. Nothing moves. The paved loop stays exactly where it is. What changes is what the county sets up on top of it for one day.
That distinction matters more than it sounds. Martial Cottle Park isn't a festival grounds that happens to have trails running through it. It's a working farm and trail system that gets dressed up for a festival once a year, and understanding which parts of the park are permanent and which parts are temporary tells you what to expect if you've never gone on the one Saturday it's crowded, or what you're actually walking through on the fifty-one Saturdays it isn't.
The Ground Doesn't Move. The Setup Does.
Martial Cottle Park sits at 5283 Snell Ave and covers roughly 280 acres, most of it still active or preserved farmland rather than manicured park lawn. The park's main trail system runs more than three miles, paved and largely flat, which is why it functions as a daily walking and biking loop for a wide radius of South San Jose rather than a destination people drive across town for.
On Fall Festival day, that paved loop stays open, but the festival itself, the pumpkin patch, the antique tractors and farm equipment, most of the vendor rows, tends to set up on the grass and packed dirt near the historic farm buildings rather than directly on the pavement. If you've only ever seen the park on a normal weekday, the festival adds a layer on ground you already know, rather than replacing it. Santa Clara County Parks runs the event, which it describes as a celebration of the valley's agricultural history, and it includes local arts and crafts, food trucks, live music, and a quiet zone with shade, seating, and sensory-friendly resources for anyone who wants a break from the crowd.
Why It's a Farm and Not Just a Park
The reason Martial Cottle looks and functions differently than a standard neighborhood park traces back to what the land was before the county took it over. It was a dairy and produce farm, and the county preserved it as working open space. The grounds still include a park-run agricultural history museum alongside the trails and picnic areas. That history is part of why the fall festival reads as a harvest celebration instead of a generic county fair. That agricultural history is still visible across the grounds.
The Demonstration Garden Doing This Work Every Week
Folded into festival day, but running independently the rest of the year, is the UC Master Gardeners of Santa Clara County's demonstration garden inside Martial Cottle Park. Their Fall Garden Fair is scheduled for Saturday, October 3, 2026, from 9 a.m. to 2 p.m., with free admission and six-dollar parking. The fair includes a plant sale focused on winter vegetables, herbs, natives, low-water succulents, and garlic and shallot bulbs, plus free gardening talks, a help desk for pest and soil questions, tool-sharpening demonstrations, a seed-sharing table, and sessions from the Master Composters and Master Food Preservers programs. Repair Café Silicon Valley, a volunteer group focused on fixing rather than discarding broken household items, is also hosting a table at this year's fair.
None of that infrastructure appears only on festival day. The demonstration garden operates year-round as a resource for anyone gardening in the surrounding neighborhood's clay soil and dry summers, and the Fall Garden Fair is simply the one day it's staffed for a crowd instead of a drop-in visitor. If you've walked past the garden beds on an ordinary Sunday without stopping, October 3 is the day those same beds come with someone standing next to them ready to answer a question.
The Trail Doesn't Stop at the Fence
Martial Cottle's paved loop isn't an isolated three miles. It sits inside a wider network that includes Almaden Lake Park nearby, which connects into both the Los Alamitos Creek Trail and the Guadalupe River Trail, giving walkers, runners, and cyclists a much longer continuous route than the festival grounds alone suggest. Further into the foothills, Santa Teresa County Park adds more than 1,600 acres of hiking and biking trails, and Almaden Quicksilver County Park, a former mercury mining site, offers hiking, biking, and horseback riding trails through oak woodland along with old mining structures and interpretive signage.
The practical version of this is that Martial Cottle functions as one entry point into a trail system that extends well past the park boundary, rather than a stand-alone loop that ends where the parking lot does. Someone parking at Martial Cottle for the festival is parking at one node of a route that keeps going in more than one direction.
What's Already Open Along the Same Stretch of Road
Blossom Hill Road, which runs past the park, already carries its own weekly rhythm that has nothing to do with the festival calendar. The Blossom Hill Certified Farmers' Market sets up at Princeton Plaza, 1375 Blossom Hill Rd, on Wednesdays and Sundays year-round, offering produce and goods from local growers.
For a meal before or after a trail walk, Blossom & Bourbon, at 632 Blossom Hill Rd, serves American dishes and cocktails out of an open kitchen built around fire cooking. A few blocks over, Casa Mía serves Colombian food and burgers, and Elements Restaurant has built a local following for its made-to-order menu. None of these require a special trip tied to festival day. They're simply already part of the same corridor the park sits on, open on any given week the same way the trail is.
What This Actually Means for October 3
If you already treat Martial Cottle's loop as part of your regular walking or biking route, October 3, 2026, doesn't ask you to plan a new outing. It asks you to expect a pumpkin patch and a plant sale on ground you already cross, park where you'd normally park, and budget six dollars if you're stopping at the Garden Fair specifically. The trail keeps running past the festival setup in both directions, toward Almaden Lake one way and deeper into the park's farmland the other, exactly as it does every other Saturday of the year.
If you're weighing what it's actually like to live near a working county park instead of a standard subdivision green space, Amanda Vang and her team know Blossom Valley's daily rhythm, not just its listing photos, and are glad to walk through it with you. Schedule a Consultation to talk through what a home near this stretch of Blossom Hill Road actually looks like day to day.
