State report · National rank #11 of 50
Colorado
Colorado is excellent zombie-survival territory once survivors escape the Front Range. It has mountains, forests, freshwater, farms, livestock, cold winters, solar and wind potential, and vast stretches of lightly populated country with naturally defensible terrain. The catch is that most residents are concentrated along one major urban corridor, mountain routes create chokepoints, winters can isolate communities, and wildfire, drought, altitude, and limited growing seasons complicate long-term survival.
Personal assessment
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Colorado scored three times
A state that handles shamblers can get erased by sprinters. Here is how Colorado performs under each outbreak model.
Slow zombies reward time, distance, terrain, local food and the ability to build a perimeter that does not need constant heroics. Colorado has about 6,012,561 people and 29.2 million acres in farm operations, plus 2.55 million cattle and calves. The question is whether survivors can get clear of the Front Range and exploit the state's geography before normal logistics begin failing.
Fast zombies erase the luxury of a slow evacuation, and road capacity only matters while the road is moving. Colorado's terrain is superb once you reach it — but Denver, Colorado Springs and Fort Collins concentrate the population along a single interstate, and that corridor is the whole problem.
Yes, we know they're not technically zombies. This is where the ZSI stops asking whether you can escape and starts asking whether you can live somewhere for ten years. Colorado has the food, terrain and distributed energy; water planning is the part that decides it.
What helps
- Rocky Mountains, high basins, mesas, canyons and large remote western areas
- Colorado River headwaters, South Platte, Arkansas and Rio Grande systems, reservoirs, mountain snowpack and groundwater
- 29.2 million acres in farm operations across 34,900 farms
- 2.55 million cattle and calves
- 5.46 billion pounds of milk, 166.25 million bushels of corn, 71.06 million bushels of wheat and 23.0 million hundredweight of potatoes in 2025
- 19,817 MW of net summer capacity in 2024, with natural gas primary plus major wind, solar and hydro resources
- Fort Carson, Peterson and Schriever Space Force Bases, Buckley Space Force Base, the U.S. Air Force Academy and Colorado National Guard forces
What hurts
- The Front Range population corridor concentrated along a single interstate
- Wildfire, drought, extreme winter weather, avalanches, hail, flash floods and localised severe storms
- Major evacuation corridors can become population funnels
- The best refuge areas may have weaker medical or logistics access
Personal assessment
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Take the readiness assessment and get your own Zombie Survival Index score!
Get my free ZSI scoreThe reason for the score
Colorado's zombie superpowers
Rocky Mountains, high basins, mesas, canyons and large remote western areas are central to the score, because terrain decides how movement gets channelled, where settlements can hide and which routes become mandatory.
1 · Mountains actually matter
Colorado has one of the best terrain packages in the country. High passes, canyons, ridgelines and isolated valleys slow movement, protect settlements and create enormous separation from urban cores.
2 · Agriculture beats the ski-resort stereotype
USDA lists 29.2 million farm acres, 2.55 million cattle and calves, more than five billion pounds of milk, and major corn, wheat, hay and potato production.
3 · Cold is useful
Colorado gets enough sustained cold and snow at elevation to create real seasonal suppression rather than mere inconvenience.
4 · Distributed energy options are excellent
Natural gas generation plus major wind and solar resources give remote settlements realistic options for local power.
The catch
One long funnel, and the fire that closes the road
The Front Range is one long human funnel
Denver, Colorado Springs, Fort Collins and their suburban corridors concentrate population along I-25. In a fast outbreak that corridor is the state's biggest liability.
Wildfire turns good terrain into bad terrain
Forested mountain communities are attractive refuges right up until fire closes the one road out.
Water is abundant and contested at once
Snowpack and rivers are major strengths, but drought, prior allocations and uneven access make water planning essential.
The framework
25 survival factors, scored 1–10
Every state is measured on the same 25 factors. Weighting shifts by scenario — terrain matters more against sprinters, agriculture matters more in a long collapse.
Tactics
What works, by scenario
| Strategy | Walking Dead | World War Z | Last of Us |
|---|---|---|---|
| Rural farm or ranch with independent water | Excellent | Very good if reached early | Excellent |
| Small agricultural town | Very good | Good | Excellent |
| Remote site with no food system | Good early | Very good for isolation | Poor long-term |
| Major highway evacuation | Good early, bad late | Terrible late | Poor after collapse |
| Major metro shelter | Poor | Terrible | Poor |
| Distributed renewable power | Very good | Good | Excellent |
| Hunting and fishing supplement | Very good | Good | Very good |
| One-road refuge | Risky | Risky | Risky |
Geography
Where to be
Western Slope agricultural valleys
Lower metro exposure, local agriculture, mountain barriers and river access create an excellent balance.
- Mountains between you and Denver
- Working irrigated farmland
- River water rather than seasonal flow
- More than one road out
San Luis Valley communities with proven water
Huge open space, cold winters and agriculture are powerful, but water management is non-negotiable.
Northwest Colorado small towns
Low density and strong terrain help, though winter logistics and medical access are thinner.
Where not to be
Denver metro and the I-25 corridor
Too many people, too much synchronised movement and too many interchanges.
One-road mountain subdivisions
A single wildfire, rockslide or abandoned truck can erase your evacuation plan.
High-elevation isolation without winter supply depth
Mountains stop zombies only after they have stopped you.
Verdict
86 out of 100 · Grade B · Rank #11
Colorado is excellent zombie-survival territory once survivors escape the Front Range. It has mountains, forests, freshwater, farms, livestock, cold winters, solar and wind potential, and vast stretches of lightly populated country with naturally defensible terrain. The catch is that most residents are concentrated along one major urban corridor, mountain routes create chokepoints, winters can isolate communities, and wildfire, drought, altitude, and limited growing seasons complicate long-term survival.
Walking Dead 91. World War Z 84. Last of Us 83.
Method & sources
Where the numbers come from
The Zombie Survival Index is a fictional entertainment ranking that uses real public data as its inputs. Every state is scored on the same 25 factors under three outbreak models, and the overall number blends those results. All fifty states have been assessed and normalised against the same national scoring set.
- U.S. Census Bureau, 2025 Population Estimates and QuickFacts
- USDA National Agricultural Statistics Service, 2025 State Agriculture Overview
- U.S. Energy Information Administration, State Electricity Profile
- State water-resource and environmental agencies
- State emergency-management agencies
- U.S. Department of Defense and National Guard installation sources
- State wildlife, hunting and fishing agencies
- NOAA and state climatology and hazard sources