At 74 acres Hudson’s Fen is the largest of the three fens. It is a long thin area of land measuring approximately 1400m x 300m. Unlike the other two fens it is not designated under the CROW act but has a public right of way running down one side of it and the old railway line, a permissive footpath, running through the centre of it. Both are well used footpaths, additionally, parishioners may access any part of the fen on foot at any time. 

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In 2022 the fen was opened up to pedal cyclists to use and to permit holding horse riders. 

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Hudson's Fen is the closest fen to the village and is the most used of the three fens.

It can be accessed from Chapel Road or the western end of Cliff-en-Howe lane.

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Roydon Common a national nature reserve adjoins the northern boundary of the fen and you can also access the fen along the old railway line that runs through the common.

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Ken's walk, named after a previous chair of the Trust weaves its way through the wood to the north of the public right of way and is a pleasant circular walk.

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Unlike the other two fens Hudson’s Fen is not a SSSI however it is designated as a County Wildlife Site in recognition of it's interesting flora and fauna.

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The fen is predominantly woodland and scattered glades with a small wet meadow at the western end. Roe deer can occasionally be spotted feeding in the grassy glades and little egrets have been seen in the meadow stream. In the early summer many species of butterflies can be seen including White Admirals that feed on the brambles and honey suckle.

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The eastern end of the fen is leased to Hudson's Fen Leisure Limited who have developed the site as a recreation area and children's playground. They have recently installed a pop up cafe, 'Kev's Kafe' and host regular car boot sales and occasional village events throughout the summer. 

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A small area of land is also leased by a clay pigeon club.