Belgium is now "Red"

It's a little hard to find on the link above, but here is more specific information from Belgium government on the steps Americans would need to go through to visit Belgium now: https://www.info-coronavirus.be/en/travels/

Currently means you need a negative test prior to travel and quarantine, test 1-2 days after arrival, and quarantine ends in 10 days or sooner if test comes back negative (assuming you are vaccinated). And of course, this could change.

Hmmm. So my September 6th trip which was 1 night in Brussels (arrival day), 3 nights in Ghent), and then 9 nights in Paris doesn't seem all that likely right now. I am fully vaxed.

Hope things change before my refund deadlines.

So you don't mean that Belgium is red, you mean that the US is red for travel to Belgium, right?

The US remains designated as "Red" by the Belgian government. Today, on Trip Advisor, someone planning to visit Belgium next week reported that the Belgian Consulate in Atlanta, Georgia advised that US CDC vaccination cards are not valid in Belgium, but that the French Pass Sanitaire is. Accordingly, we have cancelled a week-long hotel stay in Ypres. All of this is very unfortunate after the EU voted today NOT to restrict travel of Americans to Belgium

I think if you PCR test before you go and are fully vaccinated, there is no quarantine requirement. My read on the below assuming a fully vaccinated traveler from the US not having been in a very high-risk zone. See the exceptions noted below from the website regarding quarantine.

https://www.info-coronavirus.be/en/faq/
B. From a third country classified as a red zone

People who are nationals of or have their main residence in an EU country or the Schengen Area and who are returning from a third country classified as a red zone and who have stayed there for more than 48 hours must get tested on day 1 (residents in Belgium) or get tested prior to travelling (non-residents in Belgium) and on day 7 of quarantine (residents and non-residents in Belgium).

People who are not nationals of or do not have their main residence in an EU country or the Schengen Area and who are arriving from a third country classified as a red zone and who have stayed there for more than 48 hours must get tested prior to travelling (see above) and on day 7 of quarantine.

Exceptions:

Travellers who can prove that they have been fully vaccinated with a recognised vaccination certificate must get tested on day 1 and remain in quarantine until the result of the test is known, except when travellers have been on the territory of a third country classified as a very high-risk zone;
Travellers who can prove that they have been fully vaccinated with a recognised vaccination certificate and who have a negative test result prior to travelling (see above) do not need to get tested, nor must they quarantine, except when travellers have been on the territory of a third country classified as a very high-risk zone during the 14 days prior to their arrival in Belgium;

The information out there is so confusing.

On the Sherpa website
https://apply.joinsherpa.com/travel-restrictions

Most travelers from United States can enter Belgium, but there are restrictions.
Fully vaccinated travelers arriving from United States (see 148 additional countries) are required to quarantine until they test negative from a test taken on day 1 or 2 after their arrival.

Probably best to just go by what the embassy says.

Today my wife and I drove from Amsterdam, across Belgium and all the way to Lille, France on the main roads. No sign what so ever of any controls at the borders and I doubt there ever were any!