Nearly eight tonnes of rubbish was left on The Downs in just 10 days.
Bristol City Council workers collected 7.74 tonnes of waste from bins and the grounds at Clifton and Durdham Downs during the period from June 19 to 29.
The 10-day period followed the easing of lockdown restrictions and coincided with a stretch of hot weather which saw people flock to parks and beaches across the region.
Down's maintenance manager Ben Skuse said "things became crazy in terms of litter" at the end of May when temperatures started to rise and people were told they could meet people from other households outside.
Mr Skuse, who is employed by the council, said the weekend of May 30-31 was “one of the busiest I have ever seen on the Downs”.
“It basically took all of the team a week afterwards to get the Downs looking reasonable again,” he wrote in a report to the Downs Committee this week.
“The quantities of black bags of rubbish we were clearing daily was unprecedented.
"So all in all this period has been quiet until the back end of May when things became crazy in terms of litter.
"The hot conditions meaning slow grass growth has been a good thing as our tractor driver has had to spend most of his time driving to and from the waste transfer station with trailers full of rubbish cleared off the Downs."
It’s set to rain this weekend but the council is warning residents they risk prosecution if they are caught littering or fly-tipping.
For news tailored to your local area, powered by In Your Area:
A council spokesperson said: “Our parks team has recently seen an increase in waste being left in certain areas of the city.
“Over the period June 19 to 29 , the team collected 7.74 tonnes of waste from bins and the grounds at Clifton and Durham Downs.
“Environmental crime such as littering, including leaving waste by a bin or fly tipping is an offence that could result in prosecution and has a negative impact on our streets, costing taxpayers and the council thousands of pounds each year.
“We are safeguarding our employees as best we can while they undertake this essential service for the city, and are constantly updating our processes in line with Government guidance.’’
