How to e-scout a Colorado elk unit you've never hunted

You have a Colorado elk tag for a unit you’ve never walked. The map shows a few hundred square miles of timber, parks, roads and private ground, and opening day is weeks out. E-scouting won’t show you where elk will be that morning. What it can do is narrow the unit to a handful of places worth scouting and settle the logistics, so the days you have on the mountain go to hunting instead of driving around looking or staring at a map trying to figure out where to go.

This is the method we use: eight passes over the map, in order. It’s not a light-touch process — done by hand, the first pass over a new unit can take upwards of 40 hours in total.

What is e-scouting actually for?

Narrowing the unit, not finding elk. In fall, elk tend to arrange themselves around food, water, security and the rut, and the order of those needs shifts through the season. During the hunting seasons, two things tend to move elk the most: hunting pressure and snow. Research in Montana found hunter access predicted where elk went better than habitat alone, with elk shifting onto ground hunters couldn’t reach (Proffitt et al., 2013). A 2001–2017 record of Greater Yellowstone elk found fall migration timing tracked snow and hunting exposure, not the calendar (Rickbeil and Middleton, 2019).

E-scouting can’t perfectly predict the weather or the pressure, but it can tell you what ground has what elk tend to like at that time of year, and what ground you can legally and physically reach. The output is a short list of areas, a camp, and a few ways to access and hunt each area. Days in the field (pre-season or in-season) confirm or rule them out.

The order of operations matters. Run the cheap passes first to filter out areas by things like legal access and roads your vehicle can drive, so the expensive one — reading terrain — focuses on less ground.

The eight passes

1. Unit facts and harvest statistics

Start with what Colorado Parks and Wildlife publishes. The elk statistics page carries harvest reports by year, unit and season (hunters, harvest, success rate, recreation days) and population estimates by herd. Each unit sits in a larger herd unit (a DAU) that can span several units, so the herd numbers describe more than your unit.

Read success for your season and method, not all seasons combined: a unit’s archery numbers say little about 3rd rifle. Note how many hunters were in your unit in your season, and the trend over three to five years, not a single year. Harvest figures are survey estimates, not counts. Then read your hunt code in the Big Game Brochure: dates, boundaries, and any restrictions.

2. Public land and access

Colorado units mix national forest, BLM, state land and private ground, often in a patchwork. COMaP compiles ownership and public access across the state, and it is the place to start. Three things catch first-timers:

• State Trust Land is not public by default. Trust land not enrolled in CPW’s hunting and fishing access program is not publicly accessible (CPW State Trust Land Finder).
• Public land can be unreachable. A BLM parcel surrounded by private ground has no legal way in without permission.
• A map layer is not permission. Ownership data has gaps and lags. Where your route touches private ground, verify it.

By the end of this pass you have a shaded map of where you can legally hunt. Everything after this pass happens inside it.

3. Roads by vehicle and seasonal closures

On national forest land, the Motor Vehicle Use Map is the legal word on which roads are open, to which vehicles, and when. Colorado’s MVUMs are collected at Stay The Trail, and the seasonal opening and closing dates are on each map. Call the district office on the front of the MVUM to confirm dates before you plan around a road (seasonal closure information).

Mark what your vehicle can drive. Your sedan is not going up that high-clearance road, and a road open to ATVs may be closed to full-size trucks. This pass gives you an idea of the areas you can access.

Roads also matter to elk. In the Starkey Experimental Forest, collared elk selected habitat at increasing distance from open roads (Rowland et al., 2000). Open roads, closed roads and gated roads are not the same thing on the ground; note which is which.

4. Terrain

This is the long pass. Elevation, slope and aspect come from the USGS 3D Elevation Program, and any good topo shows them as contour lines.

• Elevation band for your season. Early seasons tend to sit higher; later seasons tend to sit lower as snow builds. Treat the band as a starting point that moves with snow and pressure, not with the date.
• Benches and saddles. A bench is a small flat shelf on a steep face; a saddle is a low point on a ridge between drainages. Both read clearly in contour lines, and hunters have glassed and still-hunted them for generations.
• Aspect. North and east faces hold shade, timber and moisture (elk tend to favor these in early seasons); south and west faces melt first after a storm (elk usually like these in later seasons). Which matters more depends on your season and this year’s weather.
• Glassing vantages. Look for points with a long, open view across a basin, and check what they actually see before you plan a sit there.

5. Vegetation and burns

Overlay what grows on the terrain you’ve marked. LANDFIRE maps existing vegetation type: conifer, aspen, grass and meadow, shrubland. You’re looking for edges where cover meets feed: timber against parks, aspen against open slopes, burns regrowing next to standing timber.

Burns matter. Fire perimeters and severity are mapped by MTBS back to 1984. A burn in the years after a fire tends to regrow grass, forbs and shrubs that elk use, but what a burn looks like five years later varies a lot, so check recent satellite imagery. While you’re there, check for beetle-kill and deadfall that a vegetation map still calls forest.

6. Water

Map streams, springs, ponds and stock tanks from the National Hydrography Dataset and your topo. Perennial and intermittent streams are drawn differently; in a dry fall, intermittent water may not be there. Water tends to matter most in hot, dry years and least in wet ones, so this pass gets more weight after a dry summer.

7. Pressure proxies

You can’t see other hunters from home, but you can see what tends to concentrate them: trailheads, open roads, easy grades, and the number of hunters in the harvest report for your season. You can also see what tends to thin them out: a long walk from any open road, steep entries, big patches without roads.

Mark both. Remote ground is one option; small pockets close to a road that most hunters drive past are another. Which you hunt is your call, and it depends on your legs and your days.

8. This year’s conditions

Last, check the year. Snowpack against normal from NRCS SNOTEL stations, drought from the weekly U.S. Drought Monitor, how green the country is, and fire: active fires, recent burns and fire closures, which can close the roads you planned around. Check them again the week before you leave. Conditions move.

How long does each pass take by hand?

One example of a really thorough manual pass over a unit you’ve never hunted, from our own time doing it. Your hours will differ, and a unit you already know takes a fraction of this.

Most of that time goes to terrain and access, and most of it is cross-referencing: one map open for ownership, another for roads, a third for contours, imagery in a fourth tab.

How do the passes turn into a plan?

Eight passes give you a marked-up map, not a plan. Turn it into one before you drive out:

• Areas. Pick two or three (maybe more for longer hunts), ranked, each with the reasons it made the list. A Primary, a Secondary and a Contingency for when the first two don’t pan out.
• Camps. Where you’ll sleep, how long the drive is to each area, and whether your vehicle can make it on your dates.
• Glassing spots. The points on the map you can drive or hike to that see open ground in your hunt areas. Let your glass do the walking, as they say.
• Plays. For each area, a way in (where you park, how far you hike, how much you climb), what you’d do once there, and what you’d do instead if the trailhead is full or the weather turns.
• Packout. The math before the shot: how far from the road, how many trips, how many hours, with your party.

Where does a tool compress which pass?

Passes 1, 2, 3, 6 and 8 are mostly lookups and cross-referencing, which software does in seconds once the data is available. Passes 4, 5 and 7 are judgment, and a tool can draft them but not replace them. Glassline, the app we build, runs all eight passes against Colorado data, ranks hunt areas with the reasons behind each, plans and ranks camps and ways in for your vehicle and fitness, and keeps your edits when the plan rebuilds. Every dataset behind it is listed, with its source, on the data page.

The ranking rests on what we call the Habitat Score. Glassline splits the unit into cells about 300 meters across and grades each one on four factors:

• Food: burn regrowth, meadows and parks, how green the country is, and which way slopes face for the season.
• Water: distance to year-round streams, springs and lakes, snowmelt, and this year’s snowpack.
• Breeding cover: CPW’s mapped summer concentration areas, wet seeps, open parks and timber edges.
• Shelter: how many foot-effort hours a patch sits from the nearest road open to motor vehicles, how big the remote block around it is, shade, canopy and rough escape terrain.

The weights shift with the season, your weapon and how hard the unit is hunted, and again with this year’s snow, drought, recent rain and fire. Areas then have to sit on public land your vehicle can reach, inside your fitness. Missing data lowers a score’s confidence, not the score, and each area card says how many indicators it has factored in.

Verify access, every time

Road status changes. Fire closures appear overnight. Ownership data lags behind sales and easements. Before you commit to a way in, check the MVUM dates with the district, check for fire closures, and confirm any route that touches private ground.

Every hunter is a first-timer in a unit they’ve never seen. The map work gets you to the trailhead with a plan and a backup. No tool is going to find elk for you or carry you up the mountain.