1 → Avoid the scorching summer months, when temperatures can soar past 100°F on the canyon floor. March (as I found) offers a risk of snow but also fewer people on the trail to weave around. April, October, and November are also good options.
2 → Start early enough to ensure you’ll be finishing in daylight (12 to 13 hours is a good benchmark time). Use trekking poles, and carry sufficient supplies to fuel your day, including a water filter, and to perform at least basic first aid.
3 → Check the National Park Service website (nps.gov) for updates on trail closures and water availability. Storm damage and wildfires often affect accessibility.
4 → Ideally, run with someone else. If this is not possible, notify someone of your attempt, arrange…