Winter boilies: how to make a lighter cold-water boilie recipe

David F. 13 min read Published 23/10/2026 Updated 24/10/2026

Hand in a fingerless glove holding matte, speckled dark brown winter boilies on a frosty bank at dawn, with carp rods on alarms and mist over cold, still water: smaller, lighter baits for cold-water carp fishing

In this guide

The best winter boilies are usually lighter versions of the baits you use all year: less oil, more ingredients that break down and dissolve easily, and smaller baits fed in much smaller amounts. Once the water drops below about 10 °C, carp eat far less and digest it far more slowly, so a heavy, oily bait built for summer is a poor match.

This guide gives you a full 1 kg cold-water recipe with exact weights, shows how it compares with an everyday fishmeal mix, and covers bait size, boiling and how much to put in. No bait guarantees a bite in January, but you can make sure yours suits the conditions.

Key takeaways

Below roughly 10 °C carp feed much less, and studies show digestion slowing sharply in cold water.
Cut added oil to zero or a few millilitres per kilo. Salmon oil gets noticeably thicker in the cold.
Build the mix around soluble, easily digested ingredients: predigested fishmeal, milk powder, yeast, liver and CSL.
Roll smaller baits, boil them a little shorter and feed a fraction of your summer amounts.
Our cold-water mix works out at about 7% fat in the complete recipe, against about 9% for an everyday fishmeal mix (estimates from BoilieFormula ingredient data).

Why change your boilies when the water gets cold?

Carp are cold-blooded, so water temperature sets the pace of everything they do, including how much they eat and how fast they process it. FAO guidance for carp farms says common carp eat very little below 10 °C and stop feeding at around 7 °C, which is why fish farms stop feeding their wintering ponds altogether.

Wild fish are less predictable than that. A radio telemetry study of farmed carp in winter found the fish stayed fairly active, with activity rising and falling with temperature. The same paper notes that published figures for when carp stop feeding range from 4 to 12 °C, and that some carp have been seen feeding at 0.5-3 °C. The authors also point out that both energy demand and the capacity to process food are lower in winter.

That slower processing has been measured. In a field study that followed carp through the seasons, food left the gut at about 6% per hour at 9 °C, against 32.7% per hour at 26.5 °C. In other words, a meal sits in a cold carp more than five times longer.

For bait making, the practical conclusion is simple. Carp may still feed in winter, but they take less, and they are more likely to pick up something small that releases food signals quickly than a pile of heavy, oily baits.

A cold-water boilie recipe for 1 kg of dry mix

This recipe is the Cold-Water Mix, one of the Pro templates on BoilieFormula's recipe templates page. It has no added oil at all. The attraction comes from soluble proteins and two liquid additives instead.

Ingredient	Amount (g)	Percentage	Purpose
Predigested fishmeal	250	25%	Fish protein that is already partly broken down, so it dissolves and leaks quickly
Krill meal	150	15%	Strong marine smell and taste
Defatted soya flour	150	15%	Protein and bulk with very little fat
Semolina	150	15%	Binder that gives the bait a firm skin
Skimmed milk powder	100	10%	Very soluble milk protein
Brewer's yeast	100	10%	Savoury food signal and B vitamins
Wheat gluten	100	10%	Holds a lean, low-fat paste together
Total dry mix	1,000	100%

Add these on top of the dry mix:

8 medium eggs, about 465 g once cracked
30 ml liquid liver hydrolysate
20 ml corn steep liquor (CSL)
No oil

Note: The BoilieFormula ingredient library gives 15% as the usual upper level for predigested fishmeal, so the calculator will flag the 25% in this template. Predigested fishmeals vary a lot in salt content and strength between suppliers. If you would rather stay inside the guideline, use 150 g predigested fishmeal and 100 g standard fishmeal. The total stays at 1,000 g.

If you have never rolled your own bait before, start with our simple boilie recipe for beginners. The method is the same, and that mix is more forgiving while you get the feel of the paste.

Everyday mix vs winter mix: what actually changes

Here is the cold-water recipe next to the Basic Fishmeal Mix from our beginner guide, an all-round bait many people use from spring to autumn. Both are 1 kg of dry mix.

Ingredient	Everyday mix (g)	Cold-water mix (g)
Standard fishmeal	300	0
Predigested fishmeal	0	250
Krill meal	0	150
Semolina	250	150
Full-fat soya flour	200	0
Defatted soya flour	0	150
Skimmed milk powder	100	100
Breadcrumbs	100	0
Brewer's yeast	0	100
Wheat gluten	50	100
Total dry mix	1,000	1,000

And this is what those swaps do to the numbers. The figures are estimates worked out from the typical values in the BoilieFormula ingredient library, not lab results, so your own ingredients will come out a little different.

Per 1 kg of dry mix	Everyday mix	Cold-water mix
Eggs	About 520 g (9-10 eggs)	About 465 g (8 eggs)
Added oil	10 ml salmon oil	None
Other liquids	None	30 ml liver hydrolysate, 20 ml CSL
Estimated fat in the dry mix	About 74 g (7.4%)	About 51 g (5.1%)
Estimated fat in the complete recipe, eggs included	About 9%	About 7%
Estimated protein in the dry mix	About 38%	About 52%

Three changes do most of the work. Full-fat soya, the fattiest ingredient in the everyday mix at around 20% fat, is replaced with defatted soya at around 1.5%. The salmon oil goes. And the slow, bulky fillers are swapped for ingredients that dissolve easily, such as predigested fishmeal and yeast. For reference, BoilieFormula's cold-water goal treats 8% fat in the complete recipe as the upper limit, so the everyday mix sits above it and the winter mix below.

Want to see how your own winter mix compares? Put it into the free boilie calculator, pick the cold-water goal and check the fat estimate before you buy anything.

Why winter baits need less oil

Fish oil does not behave the same in cold water. A lab study on salmon oil found it was noticeably thicker at 5 °C than at anything from 10 to 35 °C, and some of its fats only melt at well above lake temperatures. How that plays out inside a boilie on the lake bed has not been measured, but an oil that is thick and slow at 5 °C is unlikely to spread the way it does in July.

The other reason is digestion. Fat is a dense source of energy, and a carp that is processing food slowly does not need much of it. That is why the BoilieFormula calculator warns when a recipe set to the cold-water goal carries more fat than that goal allows.

Tip: If you still want some oil in a winter bait, put the bottle in the fridge for a few hours first. If it turns cloudy or thick at fridge temperature, keep it for summer. Either way, a few millilitres per kilo is plenty.

Attractors and flavours for cold water

In cold water you want a bait that gives off food signals without needing to be eaten in quantity. These are the ingredients that do that job in the cold-water mix, with their solubility as listed in the BoilieFormula ingredient library:

Skimmed milk powder: very soluble, around 90 on the library's scale
Predigested fishmeal: about 70, far higher than standard fishmeal
Liquid liver hydrolysate: a savoury liquid that mixes straight into the egg
Corn steep liquor (CSL): a sweet and sour liquid that leaks out readily
Brewer's yeast: a strong savoury smell, kept at 10% or less

Some anglers also add betaine to winter baits. The ingredient library suggests 1-5 g per kilo of dry mix, with 2 g as a typical dose. Weigh it carefully, because more is not better.

As for flavours, plenty of anglers swear by fruity or sweet flavours in winter and others stick to fish or liver. There is no good research showing one group works better in cold water, so use the dose on the bottle, pick one flavour and stay with it long enough to judge it.

How to make winter boilies, step by step

Weigh the seven dry ingredients and mix them thoroughly. Gluten and milk powder clump easily, so break up any lumps.
Crack 6 eggs into a bowl, add the liver hydrolysate and CSL, and whisk. Keep the last 2 eggs back for now.
Add the dry mix a little at a time and stir, then work it by hand once it gets stiff.
Add the remaining eggs one at a time only if the paste is still crumbly. This mix is lean, so it can feel stickier than an oily one.
Rest the paste for 10-15 minutes, then knead it briefly.
Roll smaller baits than you use in summer. 12-15 mm is a good winter size, and a few 10 mm baits are handy for a stringer or a PVA bag.
Boil in small batches. For 12-14 mm baits, try 60-75 seconds and cut one open to check the middle has set. A slightly shorter boil gives a softer bait that breaks down a bit faster.
Dry them on a towel at room temperature for about 24 hours, then bag, label and freeze them.

Warning: Roll and boil a small test batch of 200-300 g before you make a full kilo, especially with a new predigested fishmeal. If the paste is very salty or will not bind, adjust it before you scale up.

How much bait to use in winter

This is where most winter sessions go wrong. Carp eating a fraction of their summer intake cannot clear several kilos of boilies, and uneaten bait just sits there. Treat these as starting points and adjust to your water:

Hookbait only, or a small PVA bag: a good default on a quiet day or a water you do not know.
10-20 baits per rod: a sensible starting amount when you know fish are in the area.
A few hundred grams per session: usually enough on a busy water with plenty of fish, topped up only after a bite.
Crumbed or chopped baits: more smell and less food than whole boilies, which suits winter well.

If you are pre-baiting a spot, little and often works better than one big drop. Your own results on your own water will tell you more than any table.

Common winter bait mistakes

Mistake	Why it matters	What to do instead
Using the summer mix unchanged	More fat and slow fillers than cold-water carp need	Swap full-fat soya for defatted soya and drop the oil
Adding extra oil "for attraction"	Oil thickens in the cold and adds fat carp cannot use	Use soluble liquids such as liver hydrolysate or CSL
Feeding summer quantities	Bait sits uneaten on the bottom	Start with a handful per rod or just a hookbait
Rolling large baits	A big, hard bait is a lot of food for a sluggish fish	Roll 12-15 mm and boil a little shorter
Overdosing betaine or flavour	Heavy doses can make a bait taste harsh	Weigh betaine at 1-5 g per kilo and follow the bottle for flavours
Changing the bait every trip	You never learn what is working	Pick one winter mix and fish it all season

Winter bait checklist

Dry mix weighed to exactly 1,000 g
No added oil, or only a few millilitres of one that stays runny in the fridge
Soluble ingredients in the mix, such as predigested fishmeal and milk powder
Liver hydrolysate and CSL measured out
Small test batch rolled and boiled first
Baits 12-15 mm, boiled a little shorter than in summer
Baits dried, labelled with the recipe and date, and frozen
A plan for small amounts of free bait per rod

How BoilieFormula can help

Getting a winter mix right comes down to fat, solubility and balance, which is hard to judge by eye. In the free boilie calculator you can build a recipe, set it to the cold-water goal and see estimated protein, fat and cost per kilo as you change it. The free plan includes unlimited calculations, three saved recipes and basic warnings, including the one for too much fat in cold water.

With Pro you can load the Cold-Water Mix as a ready-made template, apply suggested fixes in one click and compare your summer and winter versions side by side. See what Pro includes.

Goal	What to change	What to watch in the calculator
Lighter winter version of your usual bait	Defatted soya instead of full-fat, no added oil	Estimated fat in the complete recipe
More food signal	Some predigested fishmeal, milk powder or yeast	Ingredient ranges and warnings
Keep the bait together	Enough gluten and semolina for a lean paste	Binder level and egg amount

Frequently asked questions

What water temperature counts as cold for carp?

Below about 10 °C is a useful line. Carp farm guidance says carp eat very little below that and stop at around 7 °C, but published studies give anything from 4 to 12 °C, and some carp feed in even colder water. Treat the numbers as a guide, not a rule.

Should winter boilies have less fat?

Yes, in most cases. Carp digest much more slowly in cold water, and salmon oil has been shown to thicken in the cold. A practical approach is to drop added oil and use low-fat ingredients like defatted soya, which keeps the complete recipe at around 7-8% fat or less.

What size boilies are best in winter?

Many anglers go down to 12-15 mm in winter. Smaller baits mean less food per bait, and they let you put out a few without overfeeding. Your hookbait can stay a little bigger or brighter if you want it to stand out.

How many boilies should I use in winter?

Far fewer than in summer. A hookbait with a small PVA bag, or 10-20 baits per rod, is a sensible start. Add more only if you are getting bites and know there are plenty of fish in front of you.

Can I just use my summer boilies in winter?

You can, but you are likely to do better with a lighter version. Even swapping full-fat soya for defatted soya and leaving out the oil makes a clear difference to the fat level. Roll them smaller and feed fewer.

Do winter boilies need a shorter boil?

A slightly shorter boil gives a softer bait that breaks down faster, which many anglers like in cold water. For 12-14 mm baits, 60-75 seconds is a reasonable start. Always cut one open to check the middle has set.

Final thoughts

A good winter boilie is a lighter, more soluble version of a good summer one. Take out the oil, use ingredients that break down easily, roll smaller baits and feed much less. Then fish the same mix all winter, so you can tell what the bait is doing and what the weather is doing.

If you want to check the numbers first, build your winter mix in the free calculator and see how the fat and protein estimates change as you swap ingredients.