A Quinnipiac University survey released
Thursday shows Trump trailing by just 2 points in Colorado, a state where Clinton had opened up a wide lead and where Democrats had halted advertising. Clinton is ahead 44% to 42%, within the poll's margin of error.
It's a similarly tightened race in Virginia, where ads had similarly stopped, as Clinton leads by 6 points, 45% to 39%.
In Georgia, Trump is now up by 7 points, 47% to 40%, putting some distance between himself and Clinton in what is typically a reliably Republican state.
And in Iowa, which has leaned in Trump's direction for the entire general election, he is also up by 7 points, 44% to 37%.
Gary Johnson, the Libertarian candidate, earns 10%, 8%, 9% and 10% in Colorado, Virginia, Georgia and Iowa, respectively.
"Leads for Donald Trump in Georgia and Iowa and a virtual tie in Colorado plus a 6-point lead for Clinton in Virginia represent a major improvement overall for him in these states," Peter Brown, the director of the poll, said in a statement.
After August, during which Clinton was posting at times double-digit national leads over Trump, the Republican nominee has closed the gap considerably and most surveys show a tight single-digit gap. Yet Clinton still has an easier path to 270 electoral votes
, due in no small part to Virginia and Colorado, two states expected to be battlegrounds that Clinton had been thought to have put away early in the race.
Trump would have more paths to the White House should those states become more competitive.
Quinnipiac surveyed likely voters from September 13 to September 21, and the margin of error is 3.9 percentage points in Colorado and Georgia, 3.8 points in Virginia and 4 points in Iowa.
Six hundred and forty-four individuals were polled in Colorado, 638 in Georgia, 659 in Virginia and 612 in Iowa.