With the Blues not in action until Monday the Ports had the chance to go three points clear at the top of the table, but Coleraine had other plans and took the lead in the tenth minute when Ciaran Clarke's long-range effort found its way past David Miskelly.
However, Portadown ensured a share of the spoils when Tim Mouncey fired home from inside the area after pouncing on a knock-down from Jamie Tomelty.
The result puts the Ports a point clear of Linfield at the top of the table, ahead of Monday night's Big Two meeting at the Oval.
Elsewhere, rock-bottom Glenavon secured an impressive 5-2 win over Lisburn Distillery at Mourneview Park.
A Neal Gawley header put the visitors in front in the 6th minute, before Niall Henderson's close-range effort made it 1-1 12 minutes later.
Ryan Harpur put the hosts into the lead with a superb shot from distance just after the half-hour mark, but David Cushley replied when he pounced on an Andy Hall knock-down.
That was the end of the scoring until the 82nd minute, when Diarmuid O'Carroll kept his cool to convert a penalty at the third attempt after the referee had twice ordered the spot-kick to be retaken.
Andy Graham then struck twice in stoppage time to seal a 5-2 win that leaves the Lurgan Blues just two points behind Dungannon Swifts and Carrick Rangers.
Carrick's quest to avoid the drop wasn't helped as they fell to a 2-1 defeat away to Crusaders.
Chris Scannell grabbed a brace with a goal in either half with Carrick replying through Stephen O'Neill in the 40th minute.
Dungannon Swifts, meanwhile, took a point from their meeting with Donegal Celtic at Stangmore Park after the sides played out a 2-2 draw.
DC's opener came from the unlikeliest of sources, with defender Declan O'Hara claiming his first goal for the club when he headed in from Kevin Keegan's corner after half an hour.
Swifts were back on terms two minutes after the restart when Darren Murphy capitalised on a mistake from DC keeper Robbie Robinson, but Darren Murray finished from close-range in the 61st minute to restore the visitors' lead.
However, Dungannon's Jonny Topley had the final say six minutes later when he netted with a superb half-volley.
Finally, in the game at Seaview Crusaders won a pulsating and incident-packed encounter with Ballymena United, despite losing Colin Coates to a red card eleven minutes from time.
The Crues got off to the worst possible start when Sean O'Neill fumbled an Aaron Boyd effort into his own net after just four minutes, but Stephen Baxter's side equalised three minutes later when Jordan Owens struck with a back-post header.
Owens doubled his sides tally with from inside the six-yard box in the 22nd minute when he got the final touch on Ciaran Gargan's free kick, and Coates grabbed a goal of his own 15 minutes into the second half.
Davy Munster headed home from an Alan Teggart corner to make it 3-2, before Gary McCutcheon squandered a glorious chance to equalise from the spot as he saw his effort kept out by O'Neill.
Coates received his marching orders in the 80th minute, but Crusaders held on for all three points.
IFA Carling Premiership results:
Portadown 1 - 1 Coleraine
Portadown: Mouncey 54.
Coleraine: Clarke 10.
Cliftonville 2 - 1 Carrick Rangers
Cliftonville: C Scannell 6, 75.
Carrick Rangers: O'Neill 40.
Crusaders 3 - 2 Ballymena Utd
Crusaders: Owens 7, 22, Coates 61.
Ballymena Utd: Boyd 4, Munster 73.
Dungannon Swifts 2 - 2 Donegal Celtic
Dungannon Swifts: Murphy 47, Topley 67.
Donegal Celtic: O'Hara 30, Murray 61.
Glenavon 5 - 2 Lisburn Distillery
Glenavon: Henderson 18, Harpur 32, O'Carrroll 82 (pen), Graham 90, 90+4.
Lisburn Distillery: Gawley 6, Cushley 36.