GSA sets seasonal lodging rates for Big Sky / West Yellowstone/Gardiner: the nightly lodging ceiling changes during the year (it is highest in peak travel months), while the M&IE rate stays constant.
| Season | Lodging | M&IE | Max per diem |
|---|---|---|---|
| Jun 1 – Sep 30 | $310 | $80 | $390 |
| Oct 1 – May 31 | $176 | $80 | $256 |
Big Sky / West Yellowstone/Gardiner rate history — Max per diem ($/day). Query any past effective date directly via the API.
| Period | Lodging | M&IE | Max per diem |
|---|---|---|---|
| FY2026 | $310 | $80 | $390 |
| FY2025 | $310 | $80 | $390 |
| FY2024 | $293 | $79 | $372 |
| FY2023 | $279 | $79 | $358 |
| FY2022 | $241 | $79 | $320 |
| FY2021 | $241 | $61 | $302 |
| FY2020 | $225 | $61 | $286 |
| FY2019 | $160 | $61 | $221 |
| FY2018 | $157 | $59 | $216 |
| FY2016 | $138 | $59 | $197 |
| FY2015 | $125 | $61 | $186 |
| FY2014 | $117 | $61 | $178 |
This GSA per diem rate sets the maximum reimbursable lodging and meals & incidental expenses (M&IE) for federal employees and government contractors on temporary duty (TDY) travel to Big Sky / West Yellowstone/Gardiner, Montana. Travel and expense systems use it as the ceiling for voucher reimbursement; contractors use it for DCAA-compliant travel cost modeling on proposals and invoices.
The exact request that returns this page's data. Change the
date parameter to query any historical effective
date, or pull it straight into your ERP, payroll, or expense system.
curl -H "X-API-Key: YOUR_KEY" \ "https://api.allowancesapi.com/v1/gsa/perdiem/state/US-MT?city=Big%20Sky%20/%20West%20Yellowstone/Gardiner"{
"effective_date": "2026-07-01",
"results": [
{
"destination": "Big Sky / West Yellowstone/Gardiner",
"lodging": 310,
"meals_incidental": 80,
"season_begin": "06/01",
"season_end": "09/30",
"state": "US-MT"
}
],
"verification_url": "https://www.gsa.gov/travel/plan-book/per-diem-rates"
}Allowances API is not affiliated with, endorsed by, or sponsored by any U.S. Government agency. All rate data is sourced from official public rate tables and re-published in a normalized format.