The best time for asphalt paving in Cedar Rapids is late spring through early fall, typically May through September, when temperatures stay consistently above 50 degrees and before the first frost in early October.
Cedar Rapids has a humid continental climate with cold winters and warm, humid summers. Our average last spring frost falls around May 7, and the first fall frost typically arrives around October 2, giving us about 148 frost-free days. Temperatures range from an average low of 14 degrees in January to an average high of 85 degrees in July.
Asphalt needs warm weather to cure properly. The air temperature should be at least 50 degrees and rising, and the ground temperature should be above 50 degrees as well. In Cedar Rapids, that window generally opens in early to mid-May and closes in late September or early October. Trying to pave too early in spring when the ground is still cold or too late in fall when overnight temperatures drop can lead to poor compaction and premature cracking.
Most paving contractors in Cedar Rapids are busiest from June through August. The warm season here lasts from mid-May to late September, with average daily highs above 73 degrees. July is the hottest month, with an average high of 84 degrees, which is ideal for asphalt work. The material stays workable longer in warm weather, compacts better, and cures faster.
However, summer is also our wettest season. Cedar Rapids averages over 4.5 inches of rain per month from May through August, with June typically the wettest at over 5 inches. Rain delays paving work because asphalt can't be laid on wet surfaces. If you're scheduling a project for summer, build in some flexibility for weather delays. Early fall, especially September, can be a good compromise with warm temperatures and slightly less rainfall.
Sealcoating has a narrower weather window than paving. Sealant needs at least 50 degrees during application and for 24 to 48 hours afterward to cure without rain. In Cedar Rapids, that typically means late May through mid-September. You should wait at least 90 days after new asphalt is installed before applying sealcoat, so a driveway paved in June won't be ready to seal until September at the earliest.
Most homeowners sealcoat in late summer or early fall. The asphalt has had all summer to cure, temperatures are still warm, and you're getting the driveway protected before winter freeze-thaw cycles start. Plan to sealcoat every two to three years. Our winters are hard on asphalt, with cold temps and plenty of snow. The record low in Cedar Rapids was minus 30 degrees in January 2019, and we average 32 inches of snow per year.
Cedar Rapids has seen significant weather events that damaged roads and driveways. The 2008 flood on the Cedar River was a 500-year event that flooded over 1,100 city blocks in June. The 2016 flood in late September was the second-highest crest on record. More recently, the August 10, 2020 derecho brought winds up to 140 miles per hour and damaged the majority of buildings in the city.
Severe storms and flooding can undermine driveway bases, create drainage problems, or crack asphalt. If your driveway was damaged by a storm, wait until any ground settlement has stopped and drainage issues are fixed before repaving. Spring flooding from snowmelt and heavy rains is common here, so if your property has drainage concerns, address those first. A good contractor will check your site's drainage and slope before quoting a paving job. After a major storm, expect contractors to be booked up for months, so plan ahead if you can.
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