Moving from Chicago to Denver
A climate comparison of two homes: Illinois to Colorado. The dates below come from the nearest official weather station to each place.
Climate Match
Your growing season runs 47 days shorter, 201 days becomes 154 days.
Chicago, IL to Denver, CO
The full comparison
| Measure | From | To | Change |
|---|---|---|---|
| Frost-free season | 201 days | 154 days | 47 days shorter |
| Last spring frost | April 11 | May 5 | 24 days later |
| Months below freezing | 3 months | 2 months | 1 fewer |
| Coldest month | -3C in January | 0C in December | 3C warmer |
| Warmest month | 25C in July | 23C in July | 2C cooler |
Moving from Chicago to Denver reshapes the home year. Winters get 3C warmer. Summers get 2C cooler. Your growing season is 47 days shorter. Plan on a new rhythm for the house and garden.
What changes about the house
- Heating: expect a longer or deeper heating season. Service the furnace or boiler before the first cold snap, and budget for higher heating bills.
- Milder overall: heating and cooling loads may both ease, but watch humidity and ventilation in shoulder seasons.
- Garden: a shorter season favors transplants, short-season varieties, and cold frames. Wait for soil to warm before direct sowing.
- Snow and ice: fewer freezing months reduce roof and driveway risk, but one surprise storm still happens. Keep basic winter tools for the odd freeze.
Season by season
Spring starts later
Your last spring frost moves from April 11 to May 5, 24 days later. Delay tender planting and spring openings.
Summers run cooler
The warmest month goes from 25C in July to 23C in July. Cooler peaks mean less cooling stress, but watch humidity and ventilation.
Winters turn milder
Winter coldest month goes from -3C in January to 0C in December; freezing months go from 3 months to 2 months. Budget for more heating, snow removal, and ice-dam prevention.
Tools for both places
Moving from Chicago to Denver, answered
What is the biggest climate change from Chicago to Denver?
Your growing season runs 47 days shorter, 201 days becomes 154 days. That is the largest shift in the 30-year climate record.
How are these numbers computed?
From official 30-year climate normals at the nearest station to each place: Chicago Midway Ap 72534 near Chicago and Denver Centennial Ap near Denver. They are planning averages, not forecasts; local microclimates can run a week or two off the station record.
Does the comparison work in reverse?
Yes. Open the comparison tool and swap the two places; the deltas reverse direction but the match score stays the same.
Method and sources
Temperatures and frost dates are from the 30-year climate normals at Chicago Midway Ap 72534 (near Chicago, IL) and Denver Centennial Ap (near Denver, CO). Canadian data is from Environment and Climate Change Canada; United States data is from NOAA NCEI. These are planning averages, not forecasts. See the methodology page for the full calculation.