Parent Lineage
Little Costilla Peak: 12,587' NM 2,449' Rise
| Depth | Parent | Elevation | Saddle | Prominence | State |
| 1 | 12830 | 12,830' | 12,209' | 621' | CO |
| 2 | Purgatoire Peak | 13,679' | 12,809' | 870' | CO |
| 3 | Vermejo Peak | 13,715' | 12,961' | 754' | CO |
| 4 | Red Mountain | 13,911' | 13,456' | 455' | CO |
| 5 | Culebra Peak | 14,053' | 9,250' | 4,803' | CO |
| 6 | Blanca Peak | 14,350' | 9,015' | 5,335' | CO |
| 7 | Harvard, Mount | 14,424' | 12,074' | 2,350' | CO |
| 8 | Massive, Mount | 14,427' | 12,444' | 1,983' | CO |
| 9 | Elbert, Mount | 14,439' | 5,346' | 9,093' | CO |
| 10 | Whitney, Mount | 14,500' | 4,423' | 10,077' | CA |
Green = More Prominent Parent
Immediate Children:
| # | Child | Elevation | Prominence | State |
| 1 | Baldy Mountain | 12,443' | 2,687' | NM |
| 2 | 11612 | 11,612' | 398' | NM |
| 3 | Vermejo Peak | 11,620' | 268' | NM |
| 4 | Ash Mountain, South | 11,431' | 608' | NM |
| 5 | Ash Mountain, North | 11,254' | 327' | NM |
| 6 | 11109 | 11,109' | 1,170' | NM |
| 7 | Comanche Point | 9,220' | 160' | NM |
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