Generally, VIX options and futures are available for trading during regular market hours, which are from 9:30 a.m. to 4:00 p.m. Eastern Standard Time (EST) on weekdays. The options and futures markets for VIX are closed on weekends and holidays.
However, some brokers may offer trading on VIX futures or CFDs (Contracts for Difference) through electronic trading platforms that are open 24 hours a day, five days a week. But it's important to check with your broker if they offer such service and understand the risks associated with it.
It's important to keep in mind that the VIX is a forward-looking indicator, so it's not a direct measure of the actual volatility of the market, it's a measure of the market's expectation of future volatility. Additionally, it's important to understand that the market conditions on weekends can be different from weekdays, with lower liquidity and volatility. Therefore it may be more difficult to execute trades at the desired prices, and the risk of slippage is higher.