A last gasp goal from midfielder Ben Sedgemore rescued a point for the Linnets after an absorbing top-of-the-table clash at The Walks
Sedgemore registered his first goal in Linnets colours in the dying seconds of the match to complete an amazing comeback by The Walks outfit, who trailed 2-0 after a mad 90 seconds towards the end of the first half.
Linnets boss Keith Webb said: "Playing wise, I'd say that was probably one of our best performances of the season.
"We showed great spirit and determination to comeback, but it's another game we should have won.
"A crazy 90 seconds where we were like rabbits getting caught up in headlights gifted Hemel both their goals."
Joint Hemel Hempstead manager Danny Nicholls, who side played the last 20 minutes with ten men following the sending-off of Dean Cracknell, said: "King's Lynn are a powerful and strong team and one of the best we have played this season.
"It was one-sided at times in the second half, but Lynn failed to punish is with their delivery into our box.
"Too many of their final passes went to our keeper or straight to our defenders."
Lynn dominated the first period and it was Hemel Hempstead keeper Ian Brown who stood between Lynn and an avalanche of goals in the first 45 minutes.
Brown twice denied Danny Bloomfield, before foiling both Michael Frew and Joe Francis in a one side first 45 minutes.
Hemel took the lead with their first attempt on goal in the 41st minute when Lynn went to sleep at a Cracknell free-kick and Harry Hunt was allowed a free header at the far post.
Ninety seconds later it was 2-0 when more suicidal defending led to Hunt poking home his second of the afternoon.
But Lynn reduced the arrears less than a minute later when Joe Francis played in Danny Bloomfield to notch his 15th goal of the season.
The hosts laid siege on the Hemel goal in the second half and gained numerical advantage in the 70th minute when Cracknell was sent off for a crude tackle on Dean West.
Just as it looked as though Hemel would hold on for a priceless win, Sedgemore drilled home just inside the box to salvage a crucial point.
Lynn: Howie, West (Turner 82), Chapman, Warren (Melton 79), Crane, Camm, Frew,
Sedgemore, Defty, Bloomfield, Francis. Unused substitutes: Nolan, Lake, Murray.
Hemel Hempstead: Brown, Sweeney Coulson, Cavill (Sozzo 76), Yeboah, Sinclair, Burgess (Martin 63),
Cracknell, Hunt (Gearing 76), Roberts, Edgeworth. Unused substitutes: Nicholls, Heron.
Referee: Mr Miller (Kettering), Attendance: 1.230
Bookings; Lynn: Sedgemore; Hemel Hempstead: Cavill, Hunt, Roberts,
Sent off: Hemel Hempstead: Cracknell.
MoM: Ben Sedgemore
Stats Lynn first: Shots on Target: 10,4; off target 8,3, corners 8,3; offside 3,2; free kicks conceded 12,19.