Is being in an area of Colorado that’s growing quickly a good thing or a bad thing?
Depends on who you ask.
Some want bigger, more exciting cities like Denver and Colorado Springs, while others want peace and quiet like in Brush and Estes Park, thank you very much.
But today, we’re going to put opinions aside and look at the cold, hard facts — since 2010, which cities in Colorado have grown the fastest.
After getting knee-deep in the Census’s American Community Survey using Saturday Night Science, we emerged with this set of cities in the Centennial State that have people climbing over each other to get in.
Table Of Contents: Top Ten | Methodology | Summary | Table
What’s the fastest growing city in Colorado for 2026? Based on the most recent ACS data, Timnath ranks as the fastest-growing city in Colorado. If you happen to be a resident of Timnath, you’re probably not surprised to find it on our list.
If you’re surprised — and you’re wondering why these places are a big deal — keep reading. We’ll tell you what makes each of these 10 places in Colorado grow like weeds.
For more Colorado state reading:
- Best Places To Live In The United States
- Fastest Growing States In The United States
- Best Places To Live In Colorado
- Cheapest Places To Live In Colorado
- Most Dangerous Cities In Colorado
The 10 Fastest Growing Cities In Colorado For 2026
1. Timnath
/10
2. Severance
/10
Population: 10,130
Population 2010: 2,789
Percent Growth 263.2%
Absolute Growth: 7,341
More on Severance: Data | Crime | Cost Of Living | Movers
3. Berthoud
/10
Population: 12,411
Population 2010: 5,143
Percent Growth 141.3%
Absolute Growth: 7,268
More on Berthoud: Data | Cost Of Living | Movers
4. Monument
/10
Population: 11,735
Population 2010: 4,869
Percent Growth 141.0%
Absolute Growth: 6,866
More on Monument: Data | Crime | Cost Of Living | Movers
5. Windsor
/10
Population: 37,914
Population 2010: 17,306
Percent Growth 119.1%
Absolute Growth: 20,608
More on Windsor: Data | Crime | Cost Of Living | Movers
6. John
/10
Population: 18,883
Population 2010: 8,656
Percent Growth 118.1%
Absolute Growth: 10,227
More on John: Data | Movers
7. Frederick
/10
Population: 16,651
Population 2010: 7,710
Percent Growth 116.0%
Absolute Growth: 8,941
More on Frederick: Data | Crime | Cost Of Living | Movers
8. Erie
/10
Population: 33,808
Population 2010: 16,134
Percent Growth 109.5%
Absolute Growth: 17,674
More on Erie: Data | Crime | Cost Of Living | Movers
9. Wellington
/10
Population: 11,798
Population 2010: 5,648
Percent Growth 108.9%
Absolute Growth: 6,150
More on Wellington: Data | Cost Of Living | Movers
10. Firestone
/10
Population: 18,049
Population 2010: 8,866
Percent Growth 103.6%
Absolute Growth: 9,183
More on Firestone: Data | Crime | Cost Of Living | Movers
Methodology: How We Measured The Fastest Growing Cities In the Centennial State for 2026
To figure out which cities are growing the most, we used Saturday Night Science to look at the growth rates for cities since the beginning of the decade, according to the American Community Survey put out by the census every year. Specifically:
- Current Population
- Population in 2010
- Growth rate from 2010 to Current (The latest available data which came out in Dec 2024)
We ranked all 76 Colorado cities with a population over 5,000 people from highest growth rate to lowest.
The city with the highest growth rate during this time was crowned the fastest-growing city in the Centennial State.
And for those of you who are a little rusty with their statistics, you can calculate the growth rate by the following formula:
[Current Population – Population 2010] / [Population 2010]
The data has been updated for 2026. This report is our eleventh time ranking the fastest growing cities in Colorado.
Here’s a graph of the cities in Colorado with the most significant percent increase in population:
Summary: These Places Grew Up So Fast In Colorado, You Know?
So there you have it, the fastest growing cities in Colorado are led by Timnath which has been growing at a blistering pace this decade relative to other cities and towns around the state.
The fastest-growing cities in Colorado are Timnath, Severance, Berthoud, Monument, Windsor, John, Frederick, Erie, Wellington, and Firestone.
It’ll be interesting to see if these places can keep growing at the same rate over the next couple of years. We’ll be here to let you know!
These places have been growing (or shrinking) the slowest (fastest):
- Trinidad
- Sterling
- Avon
For more Colorado reading, check out:
- Best Places To Raise A Family In Colorado
- Safest Places In Colorado
- Worst Places To Live In Colorado
Fastest Growing Places In Colorado For 2026
| Rank | City | Population | Population 2010 | Growth | Absolute Growth |
|---|---|---|---|---|---|
| 1 | Timnath | 8,941 | 447 | 1900.2% | 8,494 |
| 2 | Severance | 10,130 | 2,789 | 263.2% | 7,341 |
| 3 | Berthoud | 12,411 | 5,143 | 141.3% | 7,268 |
| 4 | Monument | 11,735 | 4,869 | 141.0% | 6,866 |
| 5 | Windsor | 37,914 | 17,306 | 119.1% | 20,608 |
| 6 | John | 18,883 | 8,656 | 118.1% | 10,227 |
| 7 | Frederick | 16,651 | 7,710 | 116.0% | 8,941 |
| 8 | Erie | 33,808 | 16,134 | 109.5% | 17,674 |
| 9 | Wellington | 11,798 | 5,648 | 108.9% | 6,150 |
| 10 | Firestone | 18,049 | 8,866 | 103.6% | 9,183 |