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Concrete Pouring Weather in Idaho: Best Months by City

Concrete Pouring season in Idaho, city by city: peak months, season boundaries, and annual workable-day counts from NOAA 1991–2020 normals. Coeur d'Alene leads with 127 workable days a year; Nampa runs the shortest at 91.

Idaho is not one climate: Coeur d'Alene banks 127 workable concrete pouring days a year while Nampa gets 91 — a spread the table below itemizes month by month. Season boundaries mark the first and last month averaging 8+ workable days against the label rules (40–90°F, nights 40°F+).

Statewide, September is the strongest month — it tops or ties the table in most listed cities. The live strips on each city page decide the week; this table decides the month. Scoring rules: methodology; the national playbook: the concrete pouring guide.

Cities in Idaho

Peak months and season boundaries from NOAA 1991–2020 normals; season = months with at least 8 workable days.
CityPeak monthsSeasonWorkable days/yr
Boise Sep, Jun, May April–June 114
Nampa Sep, Jun, May May–June 91
Coeur d'Alene Aug, Jul, Sep May–September 127
Meridian Sep, Jun, May April–June 114
Idaho Falls Jul, Aug, Sep May–September 118

The rules behind these numbers

Typical label thresholds for concrete pouring — the single ruleset used by every check on this page.
CheckThresholdWhy it matters
Air temperature 40–90°F — ideal 50–85°F DIY pours work from 40–90°F; 50–85°F is the sweet spot.
Overnight low ≥40°F during the first 48 h A low under 40°F inside the first 48 hours puts you in cold-weather concreting — not a DIY window.
Dry before no soaking (≥1.0") in the prior 24 h Rain before the pour only matters if the ground is soaked or standing in water.
Dry after <0.1" rain for 6 h after (12 h light rain after finishing still risks surface marks) A downpour in the first 6 hours can wash the surface; after final set, rain actually helps curing.
Wind ≤20 mph (rapid surface drying up to 28 mph) Hot wind pulls bleed water out faster than the slab can handle.

Always follow your product label — formulas vary. The table above is the typical range across major manufacturers, not a promise about your can.

Other tasks in Idaho

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