Scunthorpe, who are unbeaten in their last 14 matches, struck first in the 14th minute when leading marksman Sam Winnall netted his 15th goal of the season from close range, turning home strike partner Paddy Madden's shot.
"Overall it has been another good day for us," said a delighted Cook.
"I think overall a draw is a fair result.
"I thought we were the better team in the first half but in the second it was Scunthorpe who were in the ascendancy.
"They are a good side, who have done well since Russ Wilcox took charge.
"They have been on a good run, so to come here and come from behind to take a point from them is a good result for us.
"It keeps us on top of the table and for us, it's another good point along the way to where we want to be at the end of the season.
"We are talking about promotion, that's the aim for all the teams up there near the top of the table.
"Nothing was going to be decided today, but we have chalked off another big game against one of our main rivals."
Cook will now give his players an extra day off this week to re-charge their batteries.
"We have had a busy schedule of two games a week and the players deserve it for all the effort they have put in," said Cook.
"They need a time to rest before we return to action next week with another big game for us."
Scunthorpe boss Russ Wilcox was disappointed with the manner in which his side conceded a penalty on the stroke of half time for Chesterfield's equaliser.
"It was a modern day penalty, a soft one, there was not much contact," he declared.
"But we should not have allowed ourselves to get into a situation like that where we give the referee a decision to make.
"It was disappointing we did not get one in the second half when their player is all over David Mirfin at a corner.
"Anywhere else on the pitch and that is a foul."
Wilcox knows his side need to find the winning habit after now five successive draws.
"We go out there trying to win every game, as we have done in each of the 14 unbeaten games since I took over," he insisted.
"Like Chesterfield, we want to play open and attacking football but that is difficult to do in conditions like this.
"We went out to try and take three points from them but unfortunately could not quite achieve that.
"What my players are showing though is that they have a terrific work ethic and that is credit to them."
- Sports & Recreation
- Russ Wilcox
- Sam Winnall
- Eoin Doyle