LevyDay

Montana property tax deadlines

57 sourced dates. 56 of 56 Montana counties have at least one.

In Montana, state law sets the two halves, and the county treasurer sends the bills in October or November. The first half is due November 30 and the second May 31. If your bill comes late, the first half is due 30 days after it. The state Department of Revenue sets values, and you have 30 days from the date on its notice to appeal.

Next state-wide date

Nov 30, 2026 in 38 days

Last day without penalty First half due co.silverbow.mt.usOct 21

Next dates in every Montana county

CountyBills dueLast day without penaltyAppeal byExemption filing
Beaverhead County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Big Horn County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Blaine County, MTNot on fileNov 30, 2026blainecounty-mt.govOct 21Set by noticeState rulesee sourceNot on file
Broadwater County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Carbon County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Carter County, MTNot on fileNov 30, 2026cartercountymt.govOct 21Set by noticeState rulesee sourceNot on file
Cascade County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Chouteau County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Custer County, MTNot on fileNov 30, 2026custercountymt.govOct 21Set by noticeState rulesee sourceNot on file
Daniels County, MTNot on fileNov 30, 2026danielscountymt.govOct 21Set by noticeState rulesee sourceNot on file
Dawson County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Deer Lodge County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Fallon County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Fergus County, MTNot on fileNov 30, 2026fergusmt.govOct 21Set by noticeState rulesee sourceNot on file
Flathead County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Gallatin County, MTNot on fileMay 31, 2027gallatinmt.govOct 21Set by noticeState rulesee sourceNot on file
Garfield County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Glacier County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Golden Valley County, MTNot on fileNov 30, 2026goldenvalleycountymt.orgOct 21Set by noticeState rulesee sourceNot on file
Granite County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Hill County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Jefferson County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Judith Basin County, MTNot on fileNov 30, 2026jbcountymt.govOct 21Set by noticeState rulesee sourceNot on file
Lake County, MTNot on fileNov 30, 2026lakemt.govOct 21Set by noticeState rulesee sourceNot on file
Lewis and Clark County, MTNot on fileNov 30, 2026lccountymt.govOct 21Set by noticeState rulesee sourceNot on file
Liberty County, MTNot on fileNov 30, 2026libertycountymt.govOct 21Set by noticeState rulesee sourceNot on file
Lincoln County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
McCone County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Madison County, MTNot on fileNov 30, 2026madisoncountymt.govOct 21Set by noticeState rulesee sourceNot on file
Meagher County, MTNot on fileNov 30, 2026meagherco.comOct 21Set by noticeState rulesee sourceNot on file
Mineral County, MTNot on fileNov 30, 2026co.mineral.mt.usOct 21Set by noticeState rulesee sourceNot on file
Missoula County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Musselshell County, MTNot on fileNov 30, 2026musselshellcounty.govOct 21Set by noticeState rulesee sourceNot on file
Park County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeparkcountymt.govOct 21Not on file
Petroleum County, MTNot on fileNov 30, 2026petroleumcountymt.orgOct 21Set by noticeState rulesee sourceNot on file
Phillips County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Pondera County, MTNot on fileNov 30, 2026ponderacountymt.govOct 21Set by noticeState rulesee sourceNot on file
Powder River County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Powell County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Prairie County, MTNot on fileNov 30, 2026prairiecounty.orgOct 21Set by noticeState rulesee sourceNot on file
Ravalli County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Richland County, MTNot on fileNov 30, 2026richland.orgOct 21Set by noticeState rulesee sourceNot on file
Roosevelt County, MTNot on fileNov 30, 2026rooseveltcountymt.govOct 21Set by noticeState rulesee sourceNot on file
Rosebud County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Sanders County, MTNot on fileNov 30, 2026co.sanders.mt.usOct 21Set by noticeState rulesee sourceNot on file
Sheridan County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Silver Bow County, MTNot on fileNov 30, 2026co.silverbow.mt.usOct 21Set by noticeState rulesee sourceNot on file
Stillwater County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Sweet Grass County, MTNot on fileNov 30, 2026sgcountymt.govOct 21Set by noticeState rulesee sourceNot on file
Teton County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Toole County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Treasure County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Valley County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Wheatland County, MTNot on fileNov 30, 2026wheatlandcomt.govOct 21Set by noticeState rulesee sourceNot on file
Wibaux County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file
Yellowstone County, MTNot on fileNov 30, 2026State rulesee sourceSet by noticeState rulesee sourceNot on file

Every state-wide date

Date and sourceDeadlineApplies to
May 31 every yearco.silverbow.mt.usOct 21Last day without penalty Second half dueAll 32 Montana counties except Blaine, Carter, Custer, Daniels, Fergus, Gallatin, Golden Valley, Judith Basin, Lake, Lewis and Clark, Liberty, Madison, Meagher, Mineral, Musselshell, Petroleum, Pondera, Prairie, Richland, Roosevelt, Sanders, Silver Bow, Sweet Grass, Wheatland
November 30 every yearco.silverbow.mt.usOct 21Last day without penalty First half dueAll 32 Montana counties except Blaine, Carter, Custer, Daniels, Fergus, Gallatin, Golden Valley, Judith Basin, Lake, Lewis and Clark, Liberty, Madison, Meagher, Mineral, Musselshell, Petroleum, Pondera, Prairie, Richland, Roosevelt, Sanders, Silver Bow, Sweet Grass, Wheatland
Varies, see rule set by noticeparkcountymt.govOct 21Appeal deadline Appeal to the County Tax Appeal Board
The county clerk and recorder must get it within 30 days of the date on the Department of Revenue's value notice, or of its informal review decision. You get one appeal every two-year cycle.
All 56 Montana counties
After the due date see rulelccountymt.govOct 21Paying late Paying late
Under Montana law, late taxes get a 2% penalty plus interest of 5/6 of 1% a month.
All 56 Montana counties

County dates

Date and sourceDeadlineApplies to
May 31 every yearlccountymt.govOct 21Last day without penalty Second half dueLewis and Clark County
May 31 every yearmadisoncountymt.govOct 21Last day without penalty Second half dueMadison County
May 31 every yearblainecounty-mt.govOct 21Last day without penalty Second half dueBlaine County
May 31 every yearcartercountymt.govOct 21Last day without penalty Second half dueCarter County
May 31 every yearcustercountymt.govOct 21Last day without penalty Second half dueCuster County
May 31 every yeardanielscountymt.govOct 21Last day without penalty Second half dueDaniels County
May 31 every yearfergusmt.govOct 21Last day without penalty Second half dueFergus County
May 31 every yeargoldenvalleycountymt.orgOct 21Last day without penalty Second half dueGolden Valley County
May 31 every yearjbcountymt.govOct 21Last day without penalty Second half dueJudith Basin County
May 31 every yearlakemt.govOct 21Last day without penalty Second half dueLake County
May 31 every yearlibertycountymt.govOct 21Last day without penalty Second half dueLiberty County
May 31 every yearmeagherco.comOct 21Last day without penalty Second half dueMeagher County
May 31 every yearco.mineral.mt.usOct 21Last day without penalty Second half dueMineral County
May 31 every yearmusselshellcounty.govOct 21Last day without penalty Second half dueMusselshell County
May 31 every yearpetroleumcountymt.orgOct 21Last day without penalty Second half duePetroleum County
May 31 every yearprairiecounty.orgOct 21Last day without penalty Second half duePrairie County
May 31 every yearrichland.orgOct 21Last day without penalty Second half dueRichland County
May 31 every yearrooseveltcountymt.govOct 21Last day without penalty Second half dueRoosevelt County
May 31 every yearco.silverbow.mt.usOct 21Last day without penalty Second half dueSilver Bow County
May 31 every yearsgcountymt.govOct 21Last day without penalty Second half dueSweet Grass County
May 31 every yearwheatlandcomt.govOct 21Last day without penalty Second half dueWheatland County
May 31 every yearponderacountymt.govOct 21Last day without penalty Second half duePondera County
May 31, 2026 passedravalli.usOct 21Last day without penalty 2025 second half dueRavalli County
May 31, 2027 2027 onlygallatinmt.govOct 21Last day without penalty 2026 second half dueGallatin County
May 31, 2027 2027 onlyco.sanders.mt.usOct 21Last day without penalty 2026 second half dueSanders County
June 1, 2026 passedlccountymt.govOct 21Last day without penalty 2025 second half due (moved from Sunday)Lewis and Clark County
June 1, 2026 passedrosebudcountymt.govOct 21Last day without penalty 2025 second half due (moved from Sunday)Rosebud County
September 30 every yearlccountymt.govOct 21Other Apply to pay in seven partsLewis and Clark County
September 30 every yearstillwatercountymt.govOct 21Other Apply to pay in seven partsStillwater County
November 30 every yearlccountymt.govOct 21Last day without penalty First half dueLewis and Clark County
November 30 every yearmadisoncountymt.govOct 21Last day without penalty First half dueMadison County
November 30 every yearblainecounty-mt.govOct 21Last day without penalty First half dueBlaine County
November 30 every yearcartercountymt.govOct 21Last day without penalty First half dueCarter County
November 30 every yearcustercountymt.govOct 21Last day without penalty First half dueCuster County
November 30 every yeardanielscountymt.govOct 21Last day without penalty First half dueDaniels County
November 30 every yearfergusmt.govOct 21Last day without penalty First half dueFergus County
November 30 every yeargoldenvalleycountymt.orgOct 21Last day without penalty First half dueGolden Valley County
November 30 every yearjbcountymt.govOct 21Last day without penalty First half dueJudith Basin County
November 30 every yearlakemt.govOct 21Last day without penalty First half dueLake County
November 30 every yearlibertycountymt.govOct 21Last day without penalty First half dueLiberty County
November 30 every yearmeagherco.comOct 21Last day without penalty First half dueMeagher County
November 30 every yearco.mineral.mt.usOct 21Last day without penalty First half dueMineral County
November 30 every yearmusselshellcounty.govOct 21Last day without penalty First half dueMusselshell County
November 30 every yearpetroleumcountymt.orgOct 21Last day without penalty First half duePetroleum County
November 30 every yearprairiecounty.orgOct 21Last day without penalty First half duePrairie County
November 30 every yearrichland.orgOct 21Last day without penalty First half dueRichland County
November 30 every yearrooseveltcountymt.govOct 21Last day without penalty First half dueRoosevelt County
November 30 every yearco.silverbow.mt.usOct 21Last day without penalty First half dueSilver Bow County
November 30 every yearsgcountymt.govOct 21Last day without penalty First half dueSweet Grass County
November 30 every yearwheatlandcomt.govOct 21Last day without penalty First half dueWheatland County
November 30 every yearponderacountymt.govOct 21Last day without penalty First half duePondera County
November 30, 2026 2026 onlyco.sanders.mt.usOct 21Last day without penalty 2026 first half dueSanders County
Varies, see rule set by noticegallatinmt.govOct 21Last day without penalty 2026 first half due
30 days from the date on the 2026 bill. Bills hadn't gone out when we last checked.
Gallatin County