We're planning a 4 week family vacation next year, spending 4 nights in New York, a couple in Niagara Falls and a couple in Toronto before flying west for another 3 weeks. We had originally planned to fly to Denver then go up to Salt Lake City then back down to Bryce Canyon, Zion, Grand Canyon, Vegas and Los Angeles. We'd be arriving in Denver in around 4th April, but are now a bit concerned about the weather/travelling conditions around then. We'll be hiring a car and staying in motels rather then hiring an RV. Any info on whether the weather/travelling conditions are likely to be OK by early April - is Bryce canyon likely to be passable?