StacyApproved · property tax deadlines by county

Property tax deadlines in Montana

All 56 Montana counties and county equivalents. 0 have been checked against the county's own schedule; the rest follow the state schedule below.

Montana statutory schedule
InstalmentDueNotes
First halfDecember 1, 2026One-half is payable by 5 p.m. November 30, or 30 days after the notice is postmarked if later.
Second halfJune 1, 2027The remaining one-half is payable by 5 p.m. May 31.
mca.legmt.gov Delinquent tax draws interest at 5/6 of 1% per month plus a 2% penalty.

Counties

Beaverhead County Statewide schedule · Dec 1, 2026Big Horn County Statewide schedule · Dec 1, 2026Blaine County Statewide schedule · Dec 1, 2026Broadwater County Statewide schedule · Dec 1, 2026Carbon County Statewide schedule · Dec 1, 2026Carter County Statewide schedule · Dec 1, 2026Cascade County Statewide schedule · Dec 1, 2026Chouteau County Statewide schedule · Dec 1, 2026Custer County Statewide schedule · Dec 1, 2026Daniels County Statewide schedule · Dec 1, 2026Dawson County Statewide schedule · Dec 1, 2026Deer Lodge County Statewide schedule · Dec 1, 2026Fallon County Statewide schedule · Dec 1, 2026Fergus County Statewide schedule · Dec 1, 2026Flathead County Statewide schedule · Dec 1, 2026Gallatin County Statewide schedule · Dec 1, 2026Garfield County Statewide schedule · Dec 1, 2026Glacier County Statewide schedule · Dec 1, 2026Golden Valley County Statewide schedule · Dec 1, 2026Granite County Statewide schedule · Dec 1, 2026Hill County Statewide schedule · Dec 1, 2026Jefferson County Statewide schedule · Dec 1, 2026Judith Basin County Statewide schedule · Dec 1, 2026Lake County Statewide schedule · Dec 1, 2026Lewis and Clark County Statewide schedule · Dec 1, 2026Liberty County Statewide schedule · Dec 1, 2026Lincoln County Statewide schedule · Dec 1, 2026Madison County Statewide schedule · Dec 1, 2026McCone County Statewide schedule · Dec 1, 2026Meagher County Statewide schedule · Dec 1, 2026Mineral County Statewide schedule · Dec 1, 2026Missoula County Statewide schedule · Dec 1, 2026Musselshell County Statewide schedule · Dec 1, 2026Park County Statewide schedule · Dec 1, 2026Petroleum County Statewide schedule · Dec 1, 2026Phillips County Statewide schedule · Dec 1, 2026Pondera County Statewide schedule · Dec 1, 2026Powder River County Statewide schedule · Dec 1, 2026Powell County Statewide schedule · Dec 1, 2026Prairie County Statewide schedule · Dec 1, 2026Ravalli County Statewide schedule · Dec 1, 2026Richland County Statewide schedule · Dec 1, 2026Roosevelt County Statewide schedule · Dec 1, 2026Rosebud County Statewide schedule · Dec 1, 2026Sanders County Statewide schedule · Dec 1, 2026Sheridan County Statewide schedule · Dec 1, 2026Silver Bow County Statewide schedule · Dec 1, 2026Stillwater County Statewide schedule · Dec 1, 2026Sweet Grass County Statewide schedule · Dec 1, 2026Teton County Statewide schedule · Dec 1, 2026Toole County Statewide schedule · Dec 1, 2026Treasure County Statewide schedule · Dec 1, 2026Valley County Statewide schedule · Dec 1, 2026Wheatland County Statewide schedule · Dec 1, 2026Wibaux County Statewide schedule · Dec 1, 2026Yellowstone County Statewide schedule · Dec 1, 2026

About Montana property tax

Montana property tax is billed and collected county by county, so the collector — not the state — issues the bill. County treasurers use the statutory November 30 and May 31 dates, with the same 30-day postmark extension applied statewide.

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StacyApproved is an independent reference and is not a government agency. Deadlines change and exceptions apply — always confirm with your county treasurer using the official link on this page. Nothing here is tax, legal or financial advice.