Optimal Timing
1. Complete Your Sticker Album: Open the Gold Vault when you're close to finishing your sticker album, especially if you're only missing a few high-value stickers. This maximizes your chances of obtaining the specific stickers you need U4GM offers Cheap Monopoly Go Stickers to keep you ahead of your competitors. Use coupon code "harry" at checkout to get an extra 5% off your purchase. This way, you can optimize your vault picking and dominate the game.

2. During Sticker Boom Events: If possible, wait for a Sticker Boom event to open your vault. During these events, players receive a 50% increase in the number of stickers from packs, enhancing your chances of acquiring valuable stickers.

3. Before Season End: If you're nearing the end of a season, it's advisable to open your vaults in good time to avoid losing any stars. Any unused stars will be wiped at the start of the new season, so make sure to use them before they expire.

 General Vault Strategy
- Prioritize Higher Vaults: Always aim to open the most expensive vault available (the Gold Vault) as it offers the best value in terms of rewards compared to the lower-tier vaults.
  
- Avoid Opening Too Early: If you have enough stars for the Gold Vault but are not close to completing your sticker album, it may be beneficial to wait until you are in a better position to maximize your rewards.

In summary, the best time to open the Gold Vault in Monopoly Go is when you have 700 stars, are close to completing your sticker album, and ideally during a Sticker Boom event. This strategic timing will help you maximize the value of the rewards you receive from the vault.