Unit 40 Unit 40
Big-country eastern-plains pronghorn with record-class buck genetics — but it's a private-land game
Eastern New Mexico — Llano Estacado / Caprock plains, private ranch country · Last reviewed 2026-07-12
Area
3,783
sq mi
Public land
10%
approx.
Elevation
4,000–5,500
feet
Motorized
extensive
access
Overview
Unit 40 sprawls across roughly 3,783 square miles of far eastern New Mexico north and east of Fort Sumner, running up toward Santa Rosa and out onto the Llano Estacado and Caprock. It is classic shortgrass-prairie pronghorn country — prairie grasses, mesquite and dryland/irrigated crops broken by juniper-capped mesas and the Caprock escarpment. Antelope are the headline by a wide margin, with high success and a reputation for producing exceptional, even record-class, bucks; mule deer are a secondary opportunity in the juniper breaks, mesas and river brush. As with the rest of eastern New Mexico, the country is almost entirely private ranch and State Trust land, so tags and access run largely through the landowner system.
Terrain
Vast, gently rolling shortgrass plains rising to the Llano Estacado, broken by juniper-topped mesas and the Caprock escarpment, with the Pecos River drainage on the west.
Cover: Shortgrass and desert prairie with mesquite, yucca and cholla; junipers cap the mesa tops and rims; dryland and irrigated farm fields scattered through the flats.
Landmarks: Llano Estacado · Caprock escarpment · Pecos River · Taiban / Melrose plains · juniper mesas
Access
Almost the entire unit is private ranch and NM State Trust land, with very little federal public ground. Pronghorn hunting runs largely on private ranches — many quality bucks come from big deeded operations hunted by permission or through outfitters under New Mexico's landowner (private-land antelope) allocation. State Trust sections require a valid recreational access permit and are commonly landlocked behind private fences. Paved highways and county roads provide the travel grid, but most road frontage is private; secure written permission before hunting.
Managers: private ranch, NM State Trust, BLM
Access points: US 60/84 through Fort Sumner and Taiban · US 84 north toward Santa Rosa · NM 252 and county ranch roads across the plains · State Trust sections (recreational access permit required)
Species notes
Pronghorn
abundant trophyThe marquee species — open eastern-plains pronghorn with high success and genetics that produce exceptional, even record-class, bucks on the big ranches.
- →Glass the open grass and crop edges from mesa rims and high ground at first light
- →Pattern bucks on water — windmills, stock tanks and pivots — in the hot late-summer heat
- →Use the Caprock breaks, mesas and terrain folds to close on herds in the open
- →Judge mass, length and prongs carefully; this unit grows heavy, long bucks
Mule Deer
limited opportunityA secondary opportunity — mule deer hold in the juniper mesa breaks, Caprock draws and Pecos River brush rather than the open plains.
- →Hunt juniper mesa rims, Caprock draws and arroyo breaks at dawn and dusk
- →Glass river brush and cover near water and crop edges
- →Focus on the roughest, brushiest terrain in an otherwise open unit
Pro tips
- →Access is everything here — this is a private-land unit, so a landowner tag or permission is the real hurdle
- →Water dictates the hot late-summer hunt: watch windmills, tanks and pivots at first and last light
- →Glass big from mesa rims and the Caprock before committing to a stalk on the open grass
- →This unit grows record-class bucks — take time to judge mass and length before you shoot
- →Carry a State Trust access permit and verify trust sections aren't landlocked before planning on them
Watch out for
- !Nearly the whole unit is private ranch and State Trust — federal public land is minimal
- !Antelope tags run largely through landowner/private-land allocation; open public opportunity is scarce
- !State Trust sections require an access permit and are often landlocked behind private ground
- !Extreme late-summer heat, lightning and relentless wind on the open plains
- !Water is scarce away from windmills, tanks and pivots — carry your own
Logistics
Fort Sumner and Santa Rosa are the main hubs for fuel, lodging and groceries; smaller crossroads like Taiban and Melrose offer little. Expect long drives on ranch and county roads, hot late-summer antelope conditions, and self-sufficient field logistics. Cell coverage follows the highway corridors and thins out across the ranch interiors.
Nearest towns: Fort Sumner, Santa Rosa, Melrose, Taiban, Vaughn
Seasons & regulations
This page carries no season dates or regulations. Get current rules from the official New Mexico sources:
Research sources: NMDGF Game Management Unit 40 Boundary Map · GOHUNT — New Mexico Unit 40 Profile · New Mexico Big Game Hunting — Antelope Hunts (eastern plains)
FAQ
- How big is Unit 40 in New Mexico?
- Unit 40 (Unit 40) covers about 3,783 square miles, ranging from roughly 4,000 to 5,500 feet in elevation. Area is computed from the unit boundary polygon.
- How much public land is in Unit 40?
- Approximately 10% of the unit is public land. Primary managers: private ranch, NM State Trust, BLM. Always verify ownership boundaries on the ground.
- What species does the catalog list for Unit 40?
- Pronghorn, Mule Deer. For seasons, tags, and regulations, use the official New Mexico agency resources linked on this page — this page carries no regulatory information.
Put Unit 40 on your map.
Boundary lines, public/private ownership, topo, and offline maps for this unit — in Baseline Maps, free for 14 days.