Roofs can be installed year-round in Northern Arizona. But two windows
consistently produce better results, lower prices, and less stress.
Here's the full annual schedule with what to do (or avoid) each month.
January — The wait
- Why it's bad: Daytime temps in Flagstaff can be below 40 °F,
which prevents asphalt shingle sealant from activating. Wet weather
delays. Snow on roofs.
- What to do: Get bids now for spring install. Lock in pricing
before March material cost increases.
- Avoid for: Shingle, tile, metal — basically all materials.
February — Bidding season
- Why it's bad: Same as January. Many crews are on reduced winter
schedules.
- What to do: Continue bidding. By the end of February, contractors
are filling their April books.
- Avoid for: All materials.
March — The shoulder
- Why it's mixed: Lower-elevation areas (Cottonwood, Cornville,
Camp Verde) can install. Higher-elevation areas still face freeze
cycles.
- What to do: If you're below 5,000 ft, this is when you can
start. Above 6,000 ft, wait.
- Possible for: Tile, metal in low-elevation areas.
April — The opening of the spring window
- Why it's good: Daytime temps in 60–75 °F range. Dry. Light
monsoon influence still 8 weeks away.
- What to do: This is the start of prime reroof season. Book now.
- Best for: All materials. Shingle sealant activates well.
May — Peak spring
- Why it's good: Best weather window of the year. Dry, mild,
consistent.
- What to do: This is the month for reroof. Crews are at full
strength and projects move quickly.
- Best for: All materials. Especially shingle (need warm dry days
for sealant).
June (early) — The closing window
- Why it's mixed: Pre-monsoon weather is often perfect (warm and
dry), but the calendar is starting to compress against the storm
season.
- What to do: Last call for spring install. Anything started after
mid-June risks a monsoon mid-project.
- Best for: Shingle, tile, metal — but only if it can complete
before June 28 (typical 2026 monsoon onset).
July — Don't do it
- Why it's bad: Active monsoon. Daily afternoon thunderstorms.
An open roof + a 60-mph microburst = a really bad day for everyone.
- What to do: Schedule emergency tarps if needed. Don't do major
work.
- Avoid for: Anything other than emergency tarp/repair.
August — Worse than July
- Why it's bad: Peak monsoon. Most rainfall of any month. Roofers
are 100 % booked on emergency repair work.
- What to do: Document any damage from storms. File claims. Wait
for the dry window.
- Avoid for: Major work.
September (mid-late) — The fall window opens
- Why it's good: Monsoon dissipates around September 15. Weather
becomes consistently dry. Temps in 70 °F range.
- What to do: This is the second prime install season. Less busy
than May. Good pricing.
- Best for: All materials.
October — Peak fall
- Why it's good: Mid-October through end of October is the second
best window of the year. Cool but not cold. Dry. Stable.
- What to do: Book installs through end of October. Pricing often
slightly under May (less demand).
- Best for: All materials.
November — The fall window closes
- Why it's mixed: First snow potential in Flagstaff. Below-freezing
nights begin to limit shingle install windows.
- What to do: For lower elevations (Cottonwood, Cornville, etc.),
still good. For Flagstaff and Munds Park, finishing up.
- Best for: Tile and metal (less temperature-sensitive). Shingle
OK below 5,000 ft.
December — The wait, redux
- Why it's bad: Cold. Wet. Short days.
- What to do: Plan for next spring. Most contractors take
extended Christmas breaks.
- Avoid for: All materials.
Pricing by season
Average premium / discount vs annual mean (NAZ 2025 data):
| Month | Pricing |
|---|---|
| Jan–Feb | -8 % to -12 % (winter discount, but you're waiting until spring) |
| Mar | -5 % |
| Apr | -2 % |
| May | At mean (everyone wants this slot) |
| Jun (early) | At mean |
| Jul–Aug | +15 to +25 % (emergency premium) |
| Sep | -3 % |
| Oct | -5 % |
| Nov | -8 % |
| Dec | -10 to -15 % (if you can get crew availability) |
The single best price/availability combo: late October. After the
school-summer rush, before holidays, weather is perfect. Book in
late August for late-October install.
Insurance claim timing
If you're filing a hail claim from a July or August storm:
- Initial claim: file within 30 days
- Adjuster meeting: 4–6 weeks out
- Approval: 1–2 weeks after adjuster
- Install: October — perfect
The system aligns. Storms hit in July, claims work in August/September,
install in October. Plan accordingly.