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 Edgewater and Breckenridge, 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 2025? 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 2025
1. Timnath
/10
Population: 8,007
Population 2010: 447
Percent Growth 1691.3%
Absolute Growth: 7,560
More on Timnath: Data
2. Severance
/10
Population: 9,302
Population 2010: 2,789
Percent Growth 233.5%
Absolute Growth: 6,513
More on Severance: Data
3. Berthoud
/10
Population: 11,684
Population 2010: 5,143
Percent Growth 127.2%
Absolute Growth: 6,541
More on Berthoud: Data
4. Monument
/10
Population: 11,035
Population 2010: 4,869
Percent Growth 126.6%
Absolute Growth: 6,166
More on Monument: Data
5. John
/10
Population: 18,075
Population 2010: 8,656
Percent Growth 108.8%
Absolute Growth: 9,419
More on John: Data
6. Windsor
/10
Population: 35,918
Population 2010: 17,306
Percent Growth 107.5%
Absolute Growth: 18,612
More on Windsor: Data
7. Frederick
/10
Population: 15,893
Population 2010: 7,710
Percent Growth 106.1%
Absolute Growth: 8,183
More on Frederick: Data
8. Wellington
/10
Population: 11,538
Population 2010: 5,648
Percent Growth 104.3%
Absolute Growth: 5,890
More on Wellington: Data
9. Erie
/10
Population: 31,927
Population 2010: 16,134
Percent Growth 97.9%
Absolute Growth: 15,793
More on Erie: Data
10. Firestone
/10
Population: 17,353
Population 2010: 8,866
Percent Growth 95.7%
Absolute Growth: 8,487
More on Firestone: Data
Methodology: How We Measured The Fastest Growing Cities In the Centennial State for 2025
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 2023)
We ranked all 78 Colorado cities with a population over 4,000 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 2025. This report is our tenth 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, John, Windsor, Frederick, Wellington, Erie, 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 2025
| Rank | City | Population | Population 2010 | Growth | Absolute Growth |
|---|---|---|---|---|---|
| 1 | Timnath | 8,007 | 447 | 1691.3% | 7,560 |
| 2 | Severance | 9,302 | 2,789 | 233.5% | 6,513 |
| 3 | Berthoud | 11,684 | 5,143 | 127.2% | 6,541 |
| 4 | Monument | 11,035 | 4,869 | 126.6% | 6,166 |
| 5 | John | 18,075 | 8,656 | 108.8% | 9,419 |
| 6 | Windsor | 35,918 | 17,306 | 107.5% | 18,612 |
| 7 | Frederick | 15,893 | 7,710 | 106.1% | 8,183 |
| 8 | Wellington | 11,538 | 5,648 | 104.3% | 5,890 |
| 9 | Erie | 31,927 | 16,134 | 97.9% | 15,793 |
| 10 | Firestone | 17,353 | 8,866 | 95.7% | 8,487 |