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Anza-Borrego Desert State Park is located in south-central California. Park headquarters are on the western outskirts of Borrego Springs. Spring is the most enjoyable time to visit... Though, each season has its character. You can get everything you need in Borrego Springs - a small, but full-service town.
Death Valley is in eastern California, just a bit south too... The nearest major city is Las Vegas, NV. Spring is obviously the most popular time to visit. There's a chance for desert blooms from winter rains, and the temperatures are bearable. Fewer people visit in the scorching heat of summer, when temps can climb into the 120s and beyond... If you visit, carry extra water in your car, and tank-up on gas. While both are available at a couple locations within the park, it's not worth a risk to run out. This is a huge park, if you want to see all the main sights, plan at least a few days. Most of the roads are good, but it'd help to have a high-clearance vehicle if you wanted to visit a couple places. There is also a ton of backcountry to explore, and even mountains climbing to around 9000ft.