The Survation survey has the Scottish Greens on 11 per cent on the regional vote, up from the 10 per cent recorded by TNS in early June, and 10 per cent recorded by Survation in April.
Polling for next year's Holyrood election has consistently put the Greens on between 8 and 13 per cent on the regional vote, suggesting Green MSPs will be elected across each of the 8 regions.
The party, whose membership now numbers 9,000, has already selected its lead candidates for all 8 regions, including MSPs Patrick Harvie (Glasgow), Alison Johnstone (Lothian) and John Finnie (Highlands and Islands), and Councillor Mark Ruskell (Mid-Scotland and Fife). Patrick Harvie will also contest Glasgow Kelvin constituency.
Alison Johnstone, Scottish Green MSP for Lothian, said:
"With our surging, enthusiastic membership and great candidates in place we are determined to deliver our best ever result at Holyrood. Polling isn't a prediction but given the consistent numbers we're seeing, there's a clear opportunity to elect many more Green MSPs to represent Scotland's communities.
"The Scottish Parliament needs a main opposition party that is constructive yet challenging. The Scottish Greens have been a clear voice on so many issues, from the economy to local democracy and from football club ownership to fracking. We are ready to step up to a bigger role."