Best window in Seattle:
Late spring through early fall (May–September)
Why timing matters
Concrete doesn’t like:
- Heavy rain
- Freezing temps
- Rapid temperature swings
What happens if you pour at the wrong time
Too wet (winter months)
- Surface issues
- Weak curing
- Scheduling delays
Too cold
- Slower strength gain
- Risk of freezing damage
Too hot (rare here, but happens)
- Faster curing = cracking risk if not managed
Can you pour in winter?
Yes—but:
- You’ll pay more
- Crews need protection methods
- Schedule becomes weather-dependent
Real-world approach
Most contractors in Seattle slow down in winter for a reason. You can pour year-round, but spring/summer is more predictable and cost-effective.