Moving from Denver to Phoenix
A climate comparison of two homes: Colorado to Arizona. The dates below come from the nearest official weather station to each place.
Climate Match
Your growing season runs 200 days longer, 154 days becomes 354 days.
Denver, CO to Phoenix, AZ
The full comparison
| Measure | From | To | Change |
|---|---|---|---|
| Frost-free season | 154 days | 354 days | 200 days longer |
| Last spring frost | May 5 | January 8 | 117 days earlier |
| Coldest month | 31F in December | 53F in December | 22F warmer |
| Warmest month | 73F in July | 92F in July | 20F hotter |
| Months below freezing | 2 months | 0 months | 2 fewer |
Moving from Denver to Phoenix reshapes the home year. Winters get 22F warmer. Summers get 20F hotter. Your growing season is 200 days longer. 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.
- Cooling: hotter peaks make air conditioning or shading more important. Check attic insulation and window sealing so the house does not trap heat.
- Garden: a longer frost-free season opens more crop choices and succession sowings. Raised beds warm earlier in spring.
- 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 earlier
Your last spring frost moves from May 5 to January 8, 117 days earlier. Start planting and outdoor prep sooner.
Summers run hotter
The warmest month goes from 73F in July to 92F in July. Air conditioning, shading, and cooling-load planning matter more.
Winters turn milder
Winter coldest month goes from 31F in December to 53F in December; freezing months go from 2 months to 0 months. Budget for more heating, snow removal, and ice-dam prevention.
Tools for both places
Moving from Denver to Phoenix, answered
What is the biggest climate change from Denver to Phoenix?
Your growing season runs 200 days longer, 154 days becomes 354 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: Denver Centennial Ap near Denver and Phoenix Deer Valley Muni Ap near Phoenix. 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 Denver Centennial Ap (near Denver, CO) and Phoenix Deer Valley Muni Ap (near Phoenix, AZ). 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.