Spa Hotels in the USA

Mii amo in Sedona is the top pick, with access included and no resort fee, at 8.6. Castle Hot Springs in Phoenix is the all-inclusive thermal-springs pick at 8.5, for guests 18 and over, with no resort fee. Casa Palmero at Pebble Beach in Carmel is the best Carmel pick at 8.4, a stay built around the shared Pebble Beach spa. The right pick turns on use: Mii amo suits included access and the top score, Castle Hot Springs suits soaking springs with no fee, Casa Palmero suits a Carmel stay built around the shared Pebble Beach spa, and Canyon Ranch Tucson, at 7.5, suits a structured per-person program with access included.

Arizona is the state to pick for the highest scores and the most circuits you can compare, with 39 hotels scored under the current method and Mii amo's 8.6 the top of all 84. Florida suits a coastal stay with Miami's included circuits, and California suits a concentrated Carmel trip with top scores but only ten hotels scored under the current method. Each state has a different catch too: Arizona gates most of its circuits, Florida's Keys run no hot-and-cold circuit, and California's circuit, access and all-in detail is not captured yet. Start with the state that fits how you want to travel, then use its hub to sort the cities.

Sedona holds the country's top score under the current method at Mii amo, 8.6. Scottsdale runs 17 scored hotels, the most of any market, with five hot-and-cold circuits. Phoenix adds Castle Hot Springs at 8.5 and a $850 peak all-in median (October 2026). Tucson carries Canyon Ranch Tucson's 80,000 sq ft program at 7.5. Carmel holds California's three scores of 8.0 or higher. Miami includes two hot-and-cold circuits in the stay, the most of any market. Naples folds one circuit into a $75 resort fee. The Florida Keys score a median 6.5 with no hot-and-cold circuit. Santa Barbara has one scored hotel, The Ritz-Carlton Bacara at 7.6.

Peak all-in medians for an entry room on a Saturday run $842 in Scottsdale and $850 in Phoenix (October 2026), rise to $1,366 in Naples (September 2026) and $1,708 in Miami (October 2026), and land at $1,056 in the Florida Keys (October 2026). Median resort fees run $35 in Tucson, $39.50 in Phoenix, $45 in Scottsdale, $55.50 in Naples, $60 in the Keys and $65 in Miami. Service charges on treatments run mostly 20% to 22%. A few resorts price per person instead of per room: Canyon Ranch Tucson works on that basis, and its rate does not compare to an entry-room all-in. Sedona, Tucson, Carmel and Santa Barbara have too few priced hotels for a median.

Book Scottsdale and Phoenix for June through August. Peak rates arrive February and March in both markets, and Scottsdale's median off-season drop is 58.8% across 15 hotels (October 2026). Miami peaks December through February, with lows in June, July and October and a 39.1% median drop (October 2026). Naples peaks January through April and drops 49.1% (September 2026). The Florida Keys peak February and March, drop 52.0%, and their lowest months run August and October. Atlantic hurricane season runs June 1 to November 30, so pair a low-season booking with a refundable rate.

Across the seven markets with access data, 33 of 74 hotels gate the spa behind a booked treatment or membership. Twelve include access for overnight guests, and five of those include a hot-and-cold circuit in the stay: Mii amo, Castle Hot Springs and Canyon Ranch Tucson in Arizona, then The Standard Spa, Miami Beach, Faena Hotel Miami Beach and Naples Beach Club, A Four Seasons Resort in Florida. The rest split between unpublished rules, access stated as not included, and hotels with no spa. If you want a circuit without paying for a treatment up front, the five included hotels are the safe short list.

Castle Hot Springs in Phoenix is the clearest all-inclusive, an adults-only thermal-springs resort for guests 18 and over with three soaking pools and a cold plunge, and gratuities included. Canyon Ranch Tucson runs an 80,000 sq ft program resort priced per person rather than per room. Mii amo in Sedona includes spa access with 21 treatment rooms and carries a $0 resort fee, with gratuities included. Mii amo and Castle Hot Springs publish no day pass, so the all-inclusive framing is for overnight stays. These three differ from a standard spa hotel, where the room rate comes first and the circuit often sits behind a gated booking.

Scottsdale and Miami lead the scored markets with five hot-and-cold circuits each. Phoenix and Naples follow with four each, Sedona and Tucson have one each, and the Florida Keys has none across 15 hotels. Across the seven markets with circuit data, 19 of 74 hotels list both a hot and a cold element. Included circuits are rarer still: Mii amo, Castle Hot Springs and Canyon Ranch Tucson in Arizona, then The Standard Spa, Miami Beach, Faena Hotel Miami Beach and Naples Beach Club in Florida. Everywhere else a hot-and-cold circuit sits behind a booked treatment, sold separately, or has no published access rule.

Spa service charges across the scored hotels run mostly 20% to 22%, added to every treatment on top of the menu price. That means a listed price is never the final bill. Median resort fees are a separate line and vary by market, from $35 in Tucson to $75 in Santa Barbara. A few destination spas fold gratuities into the rate instead: Mii amo and Castle Hot Springs include them. Check the spa's published service policy before booking, because a fixed 22% and a discretionary one change the final total.

Three destination spas run a $0 resort fee: Mii amo, Castle Hot Springs and Canyon Ranch Tucson. Mii amo and Castle Hot Springs also roll gratuities into the rate. Canyon Ranch Tucson prices per person, so its figure does not sit against an entry-room all-in number. Standard spa hotels add a resort fee, which runs from $35 in Tucson to $75 in Santa Barbara, and treatment service charges of 20% to 22% on top of menu prices. A room rate at a resort-fee hotel therefore comes in above the advertised room, while the destination spas land at their stated basis.