How long should I wait to drive after getting high?

Waiting to drive and understanding THC dosage can help you avoid a DUI.

cannabis in an open container, displayed across a wooden table. A white banner reads “Drugged Driving: Knowing your tolerance”

CDPHE recommendations for safe consumption of cannabis

Colorado experienced an incredibly deadly year on its roadways in 2021, especially for impaired driving. Over 250 impaired drivers were involved in fatal crashes, the most since 2002. With a new year underway, it is important to make decisions that put safety first – for yourself and others.

One of the best safety measures you can take when consuming cannabis is simply to wait before you get behind the wheel. Do you want to know how long to wait before driving? Below is some information provided by our friends at the Colorado Department of Public Health and Environment.

If you plan to consume marijuana, consider the following guidelines:

  • Wait at least 6 hours after smoking marijuana containing less than 35 mg THC before driving, biking or performing other safety-sensitive activities.
  • If you’ve smoked more than 35 mg, you need to wait longer.
  • Wait at least 8 hours after eating or drinking marijuana containing less than 18 mg THC before driving, biking or performing other safety-sensitive activities.
  • If you’ve consumed more than 18 mg, wait longer — and, if you have consumed alcohol as well, it’s important to wait even longer.

In Colorado, the typical marijuana cigarette or joint contains approximately 0.5 grams of marijuana, which means you’re consuming about 60-115 milligrams (mg) of THC. The standard serving size for a marijuana edible is 10 mg.

Driving impaired should never be an option — your safety and that of those around you matters. To learn more about our campaign efforts, visit the Drugged Driving homepage here.