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Steps
Pull the governing state DOT spec's minimum temperature table, checking whether it varies by lift thickness (e.g., SCDOT tiers minimums from 55°F for thin lifts down to 35°F for thick lifts) or is a flat threshold (e.g., Ohio DOT's flat 40°F for standard binder, 50°F for polymer-modified).
Measure ambient air temperature with a calibrated thermometer away from artificial heat sources, per the spec's measurement method.
Confirm the surface is not wet or frozen, since most specs prohibit paving on wet/frozen surfaces regardless of measured air temperature.
Check for any seasonal/calendar restriction (some states bar surface-course placement in specific winter months without a DOT-approved cold-weather paving plan).
If paving near the threshold, prepare and submit any DOT-required cold-weather paving plan before proceeding.
Known gotchas
Minimum temperature thresholds vary by lift thickness in some state specs and are flat in others — assuming one generic '40°F rule' applies everywhere is wrong.
Polymer-modified binders commonly require a higher minimum temperature than standard binder in the same state's spec (e.g., Ohio's 50°F vs. 40°F distinction), and using the standard-binder threshold for a modified mix is non-compliant.
Some agencies flatly prohibit surface-course paving during specific calendar months regardless of an unusually warm day, so a favorable thermometer reading doesn't override the seasonal restriction.
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