US faces 'serious problem' as states see virus surge - Fauci
Some 7 500 people are expected to attend the outdoor event. Masks will be available but are not required.
South Dakota Republican Governor Kristi Noem told Fox News earlier this week that those who had concerns could stay home and said "we won't be social distancing".
Trump won the reliably Republican-leaning state in 2016. He has been criticised for holding large events with little social distancing in Oklahoma and Arizona in recent weeks. On Thursday he predicted a "fireworks display like few people have seen".
Native Americans, who reportedly plan to protest during the trip, have criticised Trump's visit for increasing the risk of spreading the virus and for celebrating US independence in an area that is sacred to them.
The Democratic National Committee (DNC) tweeted at one point that Trump had disrespected Native Americans and that the event was "glorifying white supremacy". It later deleted the tweet.
Both Washington and Jefferson, revered for their roles in the founding of the nation, were slave owners.
Representatives of the DNC did not respond to a request to explain the reasons for the deleted tweet.
"Instead of living up to the most basic responsibilities of his office this Independence Day, Donald Trump is still downplaying the virus, calling for a slowdown of testing, bucking social distancing guidelines, and showing Americans why we can't afford four more years of him in the White House," the DNC said ahead of the trip on Thursday.
Trump will hold another celebration for the July Fourth holiday on Saturday in Washington.