The "what plants in what terrain in what season" reference for mule deer — the specific browse, forbs, and mast species deer prefer, the elevation bands they grow in, the visual signatures you use to identify them in the field, and how feed selection shifts through spring, summer, fall, and winter. This is the food-source companion to the behavioral feed-bed loop: not WHEN deer feed (that's the loop), but WHERE the food actually grows and HOW to put glassing knobs on slopes that hold deer. "Every single spot I found deer was green, had a lot of feed. The places that were rocky and steep and didn't have feed didn't really hold deer." (Creative Hunter host)
The hunter pre-identifies the elevation band of his unit (alpine 8,000–12,000+ ft; subalpine/mixed timber 6,000–9,000 ft; foothill sage 4,000–7,000 ft; oak/mid-elevation 5,000–7,000 ft; desert/breaks 2,000–5,000 ft; burns at any elevation) and learns the 4–6 primary browse and forb species for that band BEFORE picking glassing knobs. He glasses slopes dense with the dominant plant, not "good-looking" terrain. He reads browse lines and nipped tips to confirm active use. He treats burns 2–8 years post-fire as priority terrain — the highest feed density per acre in the West. He cross-references seeps and natural mineral licks with feed plants because the combination concentrates bucks tighter than either alone (Travis Nowotny: "Even in the timber country, if you've got something that's thick and heavy, but there's a natural seep on the hill, there's going to be good feed in it. They'll hold into those areas really tight."). And he calls the state biologist for the primary winter forage, mapped bitterbrush stands, burn locations, and habitat assessments before setting foot in the unit.
Across the Intermountain West, antelope bitterbrush (Purshia tridentata) is the single most important winter forage for mule deer. Where bitterbrush is dense, deer are. Where it's absent or grazed out, deer aren't. Most hunters glass "winter range" broadly — sage country, foothills, south-facing slopes. The signal-to-noise improves 5x when you specifically map bitterbrush stands and hunt those slopes. State wildlife agencies often have bitterbrush distribution maps in GIS layers that hunters never request.
A burn aged 3–8 years post-fire is the single highest mule deer feed density per acre anywhere in the West. The canopy is gone, sunlight hits the soil, ceanothus and fireweed and lupine explode, and root-crown sprouters (oak, serviceberry, mahogany) come back as tender new shoots at perfect deer-reach height. Most hunters drive past burn scars because they look "burned" — exactly the wrong instinct. The hunter who pre-maps every burn by year in his unit gains terrain that other hunters actively avoid.
A spring or seep is just water until it intersects with feed. A bitterbrush stand or oak grove is just feed until it intersects with water. Where the two stack — a seep producing surface moisture that extends the green-up season into August/September, surrounded by browse — bucks concentrate at densities 3–5x the surrounding country. Travis Nowotny's signature pattern. Dioni Amuchastegui confirms. The seep extends the high-quality feed window by weeks, sometimes months, and mature bucks key on this tight.
Mule deer (and elk) find and revisit natural mineral licks for decades — sometimes for centuries. These show as 1–4 ft deep pawed holes on ridges or in cuts where iron oxide, salt, or other minerals have accumulated. Animals lick the soil for trace elements not available in browse, especially critical for antler growth (calcium, phosphorus, sodium). Travis Nowotny: "There'll be a big hole in the top of the ridge for no apparent reason with just thousands of tracks pouring into it — you've just found a natural mineral lick and everything in the area knows it's there." Chad Roberts: "Even during drought years when there's not a lot of feed, those little mineral pockets keep them going." Hunters who find one mark it and check it every year — they don't draw daily traffic, but every adult buck in the area passes through over time.
In Gambel oak country (Colorado west slope, Utah, Arizona, New Mexico), the size of the acorn crop dictates where mule deer live in fall — not the calendar. A heavy mast year (acorn abundance) pulls bucks down from high country 2–4 weeks EARLIER than the calendar would predict, concentrates them under oak stands, and holds them there until the mast is gone. A light mast year scatters them and bucks stay higher longer. Most hunters plan their fall hunt by date; the locals who consistently kill big oak-country bucks plan by mast intel. CPW biologists track mast surveys; hunters who ask get the answer.
State wildlife biologists have mapped — often in GIS layers — bitterbrush ranges, migration corridors (now with collared-deer GPS tracks), winter range, mast survey data, burn history, post-hunt buck:doe count locations, and rumen-content studies showing primary forage. Most of this is shareable with hunters who call. Hunters routinely spend 100+ hours on e-scouting and never spend the 20 minutes to call the biologist who has the actual data. Andy Holland (CPW) explicitly: state agencies WANT more hunter engagement in herd management because hunter ground-truth complements their data.