Quiet generator hours per state + per campground type

NPS-wide quiet hours: 10 PM - 6 AM (some units 10 PM - 7 AM). Generators prohibited during quiet hours in all NPS campgrounds. Outside quiet hours, generators typically permitted but at low ambient levels (under 60 dB at 25 ft per most NPS unit policies).

Specific NPS overlays: Yellowstone permits generators 8 AM - 8 PM only. Yosemite Valley campgrounds permit only 7-9 AM, 12-2 PM, 5-7 PM (limited windows). Grand Canyon South Rim permits 8 AM - 8 PM only.

• NPS-wide quiet hours: 10 PM - 6 AM
• Yellowstone: generators 8 AM - 8 PM only
• Yosemite Valley: 7-9 AM, 12-2 PM, 5-7 PM windows only
• Grand Canyon S Rim: 8 AM - 8 PM only

California Air Resources Board (CARB) requires generators sold + operated in California to meet CARB Tier 4 emissions standards (small spark-ignited engines under 25 hp). Generators manufactured for sale in California carry CARB compliance sticker.

Importing non-CARB generator into California is technically allowed for personal use but operating in state parks may be prohibited per park policy. Verify with each park.

Most state parks follow the NPS standard (10 PM - 6 AM). Some go more restrictive: Texas State Parks (8 PM - 8 AM in some units), Florida State Parks (11 PM - 7 AM), California State Parks (10 PM - 6 AM with additional dB limits in some units).

Always verify the specific state park's quiet hours on the reservation confirmation OR camp host check-in.

Most private RV parks + KOA networks enforce quiet hours 10 PM - 8 AM. KOA Premium + Resort tiers may enforce shorter overnight quiet hours (typically 11 PM - 7 AM).

Generator-running specifically: most private parks with full hookups discourage generator use (use shore power). Some explicitly prohibit during entire stay.

Dispersed camping on BLM + USFS has no enforced quiet hours, but social norms align with the NPS standard (10 PM - 6 AM). Violations on heavily-used dispersed sites (Moab Sand Flats, Sedona corridors) increasingly trigger ranger response from neighbour complaints.

Inverter generators (Honda EU2200i, Yamaha EF2000iSv2, Champion 2000W inverter): 48-58 dB at 25 ft. Acceptable in most campground quiet-hours environments at low load.

Conventional generators (open-frame Champion 3500W, contractor-style portable): 70-85 dB at 25 ft. Unacceptable in close quarters under any conditions.

• Inverter generators: 48-58 dB at 25 ft (quiet)
• Conventional generators: 70-85 dB at 25 ft (loud)
• Onan built-in generators in coaches: 60-72 dB depending on enclosure
• Most RV park dB limits: 60 dB at 25 ft (excludes most non-inverter)

The under-shared truth: Honda EU2200i is the de facto industry standard for camping-acceptable generators. Other brands at lower price points may meet specs on paper but fail real-world quiet-zone tests. Spend the $1,200 once and never have a campsite complaint.

Second under-shared truth: solar-only setups (300W+ panel + 100Ah lithium battery) eliminate generator use entirely for most weekend trips. Battery upgrades pay back in 12-18 months of avoided generator purchase + fuel cost.