Hot Sulphur Springs Resort & Spa

19 natural mineral pools, no chemicals, no reservations  ·  98–112°F  ·  2 hours from Denver

Tucked into a hillside above the Colorado River in the small town of the same name, Hot Sulphur Springs Resort has been drawing visitors since the 1840s — first the Ute people who regarded these waters as sacred, then prospectors, then rail travelers, and today a steady stream of Front Range locals and Rocky Mountain road-trippers who know this place by reputation. With 19 mineral pools fed by seven separate springs and not a drop of added chemicals, it’s one of the most authentically natural soaking experiences Colorado has to offer.

What distinguishes Hot Sulphur Springs from most resort-style facilities is its commitment to doing as little as possible to the water. There are no pumps, no filters, no chlorine — just gravity-fed mineral water flowing at 5 gallons per 40 seconds from springs that surface between 104°F and 126°F, distributed across pools ranging from a comfortable 98°F to a serious 112°F. Over 200,000 gallons move through the system every day, keeping the water clean without any mechanical assist. The mineral profile includes sulfur, sodium, sulfate, potassium, calcium, iron, magnesium, and trace lithium — a lineup that regulars credit with leaving them feeling noticeably different than they do after a chemically treated soak.

This guide covers everything you need to plan a visit: current pricing, directions from Denver and the surrounding region, what the experience is actually like across the hillside pools, the best time to go, and how Hot Sulphur compares to other well-known Colorado soaking options. Whether you’re day-tripping from Winter Park, building a Grand County weekend, or passing through on US-40, this is a stop worth making time for.

Quick Facts

Getting to Hot Sulphur Springs

Hot Sulphur Springs sits in Grand County on the western slope of the Continental Divide, about 90 miles west of Denver. It’s a straightforward drive that follows US-40 for the majority of the route — the same highway that threads through Winter Park and Fraser before descending into the broad valley above Granby and Kremmling. The town of Hot Sulphur Springs itself is easy to miss if you’re not paying attention, but the resort is well-signed once you’re in the area.

From Denver, take I-70 west to Exit 232, then follow US-40 northwest. You’ll climb over Berthoud Pass at 11,307 feet before dropping into Winter Park and the Fraser Valley. Continue through Granby — where US-40 curves west — and follow the highway another 10 miles to the town of Hot Sulphur Springs. In town, turn left onto Park Street and then left again onto Spring Road. The resort entrance and parking lot are immediately ahead. Total drive time is roughly 1 hour 45 minutes to 2 hours under normal conditions.

A note on navigation: cell signal deteriorates significantly once you’re west of Winter Park. Download offline maps before you leave, or note the address (5609 County Road 20) and directions from Granby, which is your last reliable signal checkpoint. Google Maps and Apple Maps both route correctly to the resort, but don’t count on a real-time reroute if you miss a turn.

In winter, Berthoud Pass is subject to closures and significant delays for snow removal and avalanche control. Check COtrip.org before departing Denver between November and April. The pass typically reopens quickly after storms, but an extra 30–60 minutes of buffer time is wise during the ski season. Once you’re past the pass and descending toward Winter Park, road conditions typically improve substantially.

What to Expect When You Visit

Hot Sulphur Springs is not a luxury spa. It’s a historic hillside resort with character — weathered decking, pools of varying sizes tiered up a mountain slope, and the occasional sulfur smell that reminds you this water is doing something real. Visitors who come expecting a polished, resort-level experience leave mildly disappointed. Visitors who come expecting a genuine, untreated mineral soak in one of Colorado’s oldest spring facilities leave ready to come back.

The Drive Through Grand County

The approach on US-40 is genuinely beautiful, especially in fall. You’ll crest Berthoud Pass and descend through aspen groves and the headwaters of the Colorado River. Give yourself the full two hours from Denver — the drive is worth enjoying, and rushing it means missing the scenery. The town of Hot Sulphur Springs is small and quiet; the resort will be on your right as you come down Spring Road.

Pay at the Lobby, Then Head Up

Day passes are purchased at the front desk. The lobby is where you’ll also rent towels and robes if needed, and access the locker rooms with showers and changing areas. Coin-operated lockers run 50 cents — bring quarters or grab change at the desk. The locker rooms were recently renovated and are clean and functional. From there, you walk out and up to the pools on the hillside.

19 Pools Across the Hillside

The pools are tiered up the slope above the lobby, connected by wooden walkways and steps. They range from small two-person soaking tubs to larger communal pools that accommodate a dozen or more. Pool temperatures vary significantly — the cooler 98–100°F pools near the bottom are good entry points, while the upper pools push toward 110–112°F. One of the most popular pools features a small waterfall. Kids under 12 are restricted to 8 designated pools.

Untreated Mineral Water, All Day

The standout quality here is the water itself. No chemicals, no circulation system — just mineral-rich water flowing continuously from seven springs. The sulfur smell is present but not overwhelming, and many regulars credit the mineral content (including trace lithium and high magnesium) with leaving joints and muscles feeling genuinely different after a soak. Spend at least 15–20 minutes per pool before moving on. Hydrate between pools — the combination of altitude and hot water dehydrates faster than most people expect.

Views, the Town, and the River

The upper pools offer views across the Colorado River valley and the surrounding mountains that are genuinely worth pausing for. The town of Hot Sulphur Springs itself is worth a short walk — the Pioneer Village Museum is a block away, and the Colorado River runs directly below the resort property. In summer, the resort’s restaurant is open for meals. Grand County is also home to excellent Gold Medal fishing along the Colorado, so consider combining your soak with a half-day on the water.

Last Entry at 9:15 pm

The resort closes at 10 pm and accepts last walk-ins at 9:15 pm. If you’re trying to catch the late-entry discount (available from 8:15 pm), plan to arrive no later than 8:30 to give yourself time to check in and get to the pools. The drive back over Berthoud Pass at night in winter deserves respect — check road conditions before you head out, and consider staying overnight in the resort’s motel or in nearby Granby if conditions look uncertain.

Hot Sulphur Springs is not the most glamorous stop on the Colorado hot springs circuit. The decking is showing its age in places, the pools are modest in size, and the sulfur smell is real. But if you care about the quality of the water rather than the quality of the towels, this place is hard to beat. The no-chemicals policy is genuine, the mineral content is exceptional, and the hillside setting above the Colorado River has a low-key charm that the big resort operations can’t replicate. Come with appropriate expectations and you’ll leave a regular.

What to Bring

Bring a swimsuit and flip-flops at minimum — the walkways between pools are wet and the decking can be slippery, so footwear with grip is worth it. Towels and robes are available to rent in the lobby if you don’t want to pack them. The locker rooms have showers and changing areas, so plan to rinse off before you leave; the mineral water leaves a sulfur residue that you’ll want off before the drive home.

Water and snacks are strongly recommended. The resort has a restaurant, but it’s not always open for every session, and a two-hour mineral soak at altitude in 100°F+ water will leave you hungry and dehydrated faster than expected. A large water bottle, a light snack for between pools, and some cash for the coin lockers (50¢ each) round out your kit. Leave glass containers at home — they’re not permitted in the pool areas.

Don’t bring: alcohol, food to eat in the pools, pets (only medically trained service animals with vests are allowed), or expectations of strong cell service. The resort explicitly does not allow smoking or vaping anywhere on the pool property. Pack a book or be prepared to actually disconnect for a few hours — the spotty signal is a feature, not a bug.

The mineral content here is the real draw — sulfur, magnesium, lithium, and a dozen other minerals flowing untreated from seven springs. Bring a water bottle and stay in the pools longer than you think you should.

Best Time to Visit

Hot Sulphur Springs is genuinely good year-round, which is rarer than it sounds. In summer, the chlorinated swimming pool opens alongside the mineral pools, making it a stronger family option during the July and August peak. The downside is that summer weekends can get crowded — particularly on holiday weekends when Front Range day-trippers are heading west. Shoulder seasons (late May through June, September through mid-October) deliver the best combination of comfortable air temperatures, manageable crowds, and dramatic scenery.

Winter is the sleeper pick for serious soakers. There’s something genuinely special about sitting in 108°F mineral water while snow falls on the surrounding mountains, and the resort sees far fewer visitors between November and March. The catch is Berthoud Pass: always check COtrip.org before you leave Denver in winter, and budget extra time. The pass sits at 11,307 feet and is subject to closures and delays. If you’re willing to deal with that variable, a midweek winter visit might be the most peaceful soak in the state.

Quick Timing Guide

Best overall: Late September–early October — fall color on US-40, mild air temps, smaller crowds
Best for solitude: Midweek mornings in November–February — the resort is quiet, the steam rising off the pools is dramatic
Best light for photos: Morning in any season — east-facing hillside catches early light across the valley
Avoid: Summer holiday weekends (Memorial Day, Fourth of July, Labor Day) — maximum Front Range crowds

Hot Sulphur Springs vs. Other Springs

Hot Sulphur Springs occupies a distinctive niche: it’s a legitimate resort with lodging and infrastructure, but it operates more like a natural spring in terms of water quality. That puts it in a different category from the polished facilities at Glenwood and Strawberry Park, and ahead of purely primitive options in terms of comfort. The honest comparison is value — $30 for all-day access to 19 untreated mineral pools is genuinely competitive with anything else in the state.

For Grand County visitors, the relevant regional comparisons are Strawberry Park in Steamboat (roughly 90 miles northwest) and Idaho Springs’ Indian Hot Springs (about 60 miles east toward Denver). Both are worth knowing, but neither offers the same combination of no-chemicals water and all-day access at this price point.

* Prices current as of 2026. Verify entry fees directly with each venue before visiting.

Pros & Cons

Hot Sulphur Springs is a clear win for anyone who prioritizes water quality and value over luxury amenities. It’s not the right fit for visitors expecting a Glenwood-style resort experience. Here’s the full picture.

What Works

• 100% natural, untreated mineral water — no chemicals of any kind
• 19 pools across a range of temperatures (98–112°F)
• All-day access for a single entry fee — no timed sessions
• No reservations required for day use; walk-ins always welcome
• Genuine history dating to the 1840s and Ute sacred use
• On-site lodging with pool access included in room rates
• Late entry discount after 8:15 pm significantly cuts the price
• Relatively low crowds compared to Glenwood or Strawberry Park

What to Know

• Facility is aging — decking and infrastructure show wear
• Sulfur smell is noticeable and can be off-putting for first-timers
• Cell signal is essentially nonexistent on property
• Berthoud Pass adds risk and time to the Denver approach in winter
• Individual pools are relatively small — can feel crowded in peak season
• Kids under 12 restricted to only 8 of the 19 pools
• Not pet-friendly under any circumstances
• Restaurant not always open; plan food and water independently

Frequently Asked Questions

Explore More Colorado Hot Springs

Hot Sulphur Springs pairs well with other Grand County and northern Colorado soaking destinations. If you’re making a longer trip out of it, Strawberry Park in Steamboat Springs is a natural next stop heading northwest on US-40, and the Yampa Valley adds two or three more worthy options.

• Strawberry Park Hot Springs
• Glenwood Hot Springs
• Waunita Hot Springs Ranch
• All Colorado Hot Springs Map