Alton, ON
Millcroft Inn & Spa
Four-diamond Caledon countryside spa: outdoor hot spring pools, contrast hydrotherapy, cedar sauna, and award-winning dining 60 minutes from Toronto
Overview
About the stay
Highlights
The experience
Outdoor hot spring pools and polar plunge
Two 104°F thermal pools and a 45°F cold plunge, open year-round from 8 a.m. to 9 p.m. — contrast hydrotherapy in the Caledon countryside, complimentary with all overnight stays.
Cedar sauna and eucalyptus steam room
A complete indoor wellness circuit — cedar sauna, eucalyptus steam room, and indoor pool — extending the hydrotherapy environment year-round regardless of season.
Headwaters Restaurant and Shaw's Creek Falls
Award-winning fine dining overlooking the waterfall on Shaw's Creek — locally inspired cuisine, property-harvested honey and maple syrup, and a dining room that justifies the drive from Toronto alone.
100 acres and the Bruce Trail
The resort grounds connect directly to the Bruce Trail and Forks of the Credit Provincial Park — hiking, cycling, snowshoeing, and the landscapes of the Hills of Headwaters watershed.
Country-chic guest rooms and suites
52 individually decorated rooms and suites in the four-diamond Vintage Hotels standard — a countryside inn that takes comfort as seriously as it takes the spa.
Stay
Your journey
- 1
Arrival in Alton village
The drive from Toronto through the Hills of Headwaters deposits you in one of Caledon's most charming historic villages — the mill buildings, the creek, and the stone architecture signal immediately that this is not a highway-adjacent resort.
- 2
Outdoor hot spring pools
The thermal circuit begins at the 104°F outdoor pools set within the Caledon countryside — season-dependent views (snow in winter, green hills in summer) — then to the 45°F polar plunge pool for the contrast that defines the experience.
- 3
Indoor spa and sauna
The Millcroft Spa Centre, eucalyptus steam room, cedar sauna, and indoor pool extend the hydrotherapy environment inward — a full restoration circuit available from 8 a.m. to 9 p.m. daily.
- 4
Trails and Caledon countryside
Hike or bike the 100-acre grounds, access the Bruce Trail directly from the property, or explore the Forks of the Credit Provincial Park — landscape with genuine restorative quality beyond the spa pavilion.
- 5
Dinner at Headwaters Restaurant
Award-winning fine dining overlooking Shaw's Creek Falls — a dining room that earns its reputation with locally inspired cuisine, the inn's own honey (harvested on property), and maple syrup from trees on the grounds.
Packages
Ways to stay
Spa Escape Package
From ~CAD $550/night (2 guests, Sun–Thu) — confirm at vintage-hotels.com
Overnight accommodation plus $125 spa credit per guest. Year-round availability. Access to all hydrotherapy facilities included.
Book this packageSummer Lovin' Package
From ~CAD $330/night (2 guests, Sun–Thu) — confirm at vintage-hotels.com
Overnight stay with full access to outdoor and hot spring pools, hiking and biking trails, and evening firepits. June 21–September 22, 2026.
Book this packageStandard Overnight Stay
Confirm at vintage-hotels.com/millcroft-inn
Country-chic guest room or suite with hot spring pool access included. Add spa treatments when booking.
Book this packageGallery
More of the place
Good to know
Practical details
Millcroft Inn & Spa is at 55 John Street, Alton, ON L7K 0C4. From Toronto: take Highway 410 North to Highway 10 North toward Orangeville, then west on County Road 136 to Alton, approximately 60 minutes. EV charging on site. Valet parking available.
minimumStay
Weekend stays may require a 2-night minimum — confirm at vintage-hotels.com/millcroft-inn.
children
Millcroft Inn is primarily oriented toward adult guests. Confirm family policies when booking.
cancellation
See vintage-hotels.com for current cancellation and deposit terms.
Where is Millcroft Inn & Spa located?
Millcroft Inn & Spa is at 55 John Street, Alton, Ontario L7K 0C4 — in the Village of Alton within Caledon's Hills of Headwaters region, approximately 60 minutes northwest of Toronto via Highway 10.
What are the outdoor hot spring pools at Millcroft?
The outdoor hot spring pools are the centrepiece of the Millcroft wellness experience: two pools maintained at approximately 104°F (40°C) for deep thermal relaxation, plus a polar plunge pool at approximately 45°F (7°C) for contrast hydrotherapy. The pools are open daily from 8 a.m. to 9 p.m. and are complimentary for overnight guests and spa treatment guests.
What is contrast hydrotherapy and why does Millcroft offer it?
Contrast hydrotherapy — alternating between hot and cold water — supports circulation, eases muscle tension, and promotes a sense of renewal. At Millcroft, the 104°F hot spring pools and 45°F polar plunge pool provide an accessible version of a practice rooted in European spa tradition and sports recovery science.
How many rooms does Millcroft Inn have and what are they like?
Millcroft has 52 guest rooms and suites in country-chic style — individually decorated with premium bedding, amenities appropriate to a four-diamond property, and views of the Caledon countryside or grounds. See vintage-hotels.com/millcroft-inn/accommodation for current room categories.
What spa treatments are offered at Millcroft?
The Millcroft Spa Centre for Well-Being offers holistic massage, body treatments, facial and skin care therapies, and specialty treatments. The spa operates daily 9 a.m.–6 p.m. Spa services must be booked in advance. Day spa access (facilities only) may be available with a booked treatment — confirm at vintage-hotels.com.
Is Millcroft Inn dog-friendly?
Yes. Millcroft Inn & Spa offers dog-friendly accommodation options. Confirm pet policy and applicable fees when booking at vintage-hotels.com/millcroft-inn.
What trails and outdoor activities are near Millcroft Inn?
The property's 100 acres of Caledon countryside include hiking trails and connect directly to the Bruce Trail and Forks of the Credit Provincial Park. Bike rentals and snowshoe rentals are available on-site, and the surrounding Hills of Headwaters region offers charming villages, art galleries, local cideries and breweries, and championship golf courses.
How do I book at Millcroft Inn & Spa?
Book directly at vintage-hotels.com/millcroft-inn or call 1-888-669-5566. The Spa Escape Package and Summer Lovin' package offer the best value for couples combining accommodation and spa access. Spa treatments must be booked in advance.
Ask Serena
Questions for this stay
Stay-specific prompts — opens the MindReach getaway planner.
Ready when you are
Book on the property site — we do not mark up stays.
Ask an AI about this stay
Launches a full research brief that cites this Getaways profile (and MindReach twin) — packages, vibe, book-direct honesty.