What processors look for in a fry potato

Not every potato can become a good frozen fry. Processors select varieties against a fairly strict set of traits, because the raw tuber sets the ceiling on final quality — no amount of clever processing rescues the wrong potato. Three characteristics dominate the choice.

Dry matter (solids). The single most important trait. Fry processors want roughly 20–25% dry matter. Higher solids mean less water, which produces a fry that is crisp outside and fluffy inside and absorbs less oil; below about 18%, potatoes soak up oil and turn greasy and soggy.

Low reducing sugars. Sugars react with heat during frying to brown the fry. Too much sugar gives dark, blotchy, bitter fries — and darker fries can also carry more acrylamide. So processing varieties are bred and stored to keep reducing sugars low.

Shape and eyes. Long, oval tubers with shallow eyes yield more full-length strips and peel cleanly with minimal loss — directly affecting yield and waste.

The standard: Russet Burbank

The Russet Burbank remains the global benchmark for processing fries. Its lineage traces to the original Burbank potato from the 1870s, with the russet cultivar in use since around 1914 — and, remarkably, the genetics are essentially unchanged today. It combines high dry matter, a favourable sugar profile, and the long shape processors want, and it benefits from a century of accumulated growing and storage expertise. In North America especially, it still underpins much of the fry supply.

Its limitations — relatively demanding to grow, variable yields, susceptibility to some stresses — are exactly what newer varieties try to improve on.

The newer processing varieties

Breeders have released varieties that match Russet Burbank's fry quality while improving yield, disease resistance, water use, or storage:

  • Shepody — a Canadian variety bred specifically for processing, with excellent fry colour and very low reducing sugars; an early-season workhorse.
  • Ranger Russet — better storage and notably less cold-induced sweetening than Burbank, with good usable length; well suited to export-grade fries.
  • Umatilla Russet and Clearwater Russet — newer russets offering reduced water needs, pale fry colour, and disease resistance, suited to more sustainable production.
  • Innovator — a Dutch variety widely grown in Europe, valued for high dry matter, blight resistance and high yields; a backbone of European premium-fry supply.
  • Maris Piper — the UK standard for "chips," high-starch and floury, the British counterpart to the Russet.

Storage and the sugar problem

A recurring theme across varieties is cold-induced sweetening: when potatoes are stored cold, starch converts to sugars that darken and embitter fries. This is why variety choice and storage strategy are linked — processors favour varieties that resist sweetening so they can store longer, hold fry colour, and (a growing concern) keep acrylamide down. It is also why agronomy and storage know-how, not just genetics, determine whether a crop fries well months after harvest.

Why variety choice is a strategic decision

For growers and processors, variety selection is increasingly a hedge — against heat and water stress, disease, storage losses, and tightening quality and sustainability expectations. The Russet Burbank's century-long reign shows how much inertia there is in a system built around one potato, but the steady adoption of Innovator, Ranger, Clearwater and others shows the field is slowly diversifying as climate and cost pressures grow.

Methodology: varietal characteristics and agronomic ranges (dry matter, sugars, shape) are drawn from the Idaho Potato Commission and corroborating horticultural and industry sources listed in Sources. Specific figures vary by growing region, season, and storage conditions.