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Deep Caves in the State of Montana |
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| Rank | Cave Name | Depth (ft) | Length (ft) | County |
| 1 | Virgil the Turtle's Greathouse Cave | 1586 | 5394 | Flathead |
| 2 | Silvertip Cave System | 1089 | 30702 | Flathead |
| 3 | Sunray-Sunset Cave System | 801 | 4928 | Flathead |
| 4 | Lost Creek Siphon | 650 | 997 | Park |
| 5 | Flathead Alps Cave | 642 | 1114 | Powell |
| 6 | Meanderbelt Cave | 633 | 3959 | Flathead |
| 7 | Lewis and Clark Cavern | 580 | 10063 | Jefferson |
| 8 | Moonray Cave | 563 | 2590 | Flathead |
| 9 | Greenhouse Cave | 562 | 1521 | Flathead |
| 10 | Ram's Horn Cave | 493 | 4750 | Meagher |
| 11 | Tears of the Turtle Cave | 435 | 1246 | Flathead |
| 12 | French Creek Cave | 434 | 9669 | Beaverhead |
| 13 | Reaper's Rock Pile | 419 | 749 | Teton |
| 14 | The Cave That Summer Forgot | 412 | 1763 | Flathead |
| 15 | Lillyguard Cave | 410 | 2100 | Judith Basin |
| 16 | Cop Out Cave | 408 | 874 | Flathead |
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Other Significant Deep Caves in the State of Montana |
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| Rank | Cave Name | Depth (ft) | Length (ft) | County |
| 15 | Hole in the Wall Cave | 384 | 2266 | Flathead |
| 16 | Poia Lake Cave | 365 | 5480 | Glacier |
| 17 | Whitaker Sink | 345 | 1200 | Judith Basin |
| 18 | Blood Cave | 333 | 14328 | Flathead |
| 19 | Tate-Poetter Cave | 327 | 1975 | Fergus |
| 20 | Algal Cave | 305 | 2060 | Flathead |
| 21 | Mill Creek Crystal Cave | 300 | 4000 | Park |
| 22 | Lone Goat Pit | 287 | 381 | Flathead |
| 23 | Flakey Cave | 279 | 4503 | Flathead |
| 24 | Ibex Mountain Cave | 268 | 341 | Flathead |
| 25 | Frogg's Fault Cave | 261 | 400 | Carbon |
| 26 | Clone Cave | 254 | 1217 | Flathead |
| 27 | Sardine Cave | 250 | 747 | Flathead |
| 28 | Lick Creek Cave | 240 | 4000 | Cascade |
| 29 | Spinshaft Cave | 230 | 250 | Flathead |
| 30 | Volcano Reef Cave | 230 | 450 | Teton |
| 31 | Garrity Cave | 227 | 602 | Deer Lodge |
| 32 | Soft Core Crevasse | 222 | 448 | Lewis and Clark |
| 33 | Azure Cave | 220 | 1580 | Philips |
| 34 | Peterson Meadow Cave | 212 | 356 | Granite |
| 34 | Twin Sister Cave - West Shaft | 212 | 230 | Judith Basin |
| 35 | Bird Cave | 205 | 922 | Flathead |