Winter Bulk: Is Winter the Best Time to Gain Muscle?

A winter bulk works well because the cooler months suit a slow, steady lean bulk: you are training indoors anyway, there is no summer cut on the calendar, and eating a little more feels easier when it is cold. Winter does not make muscle grow faster, but it is a practical window to gain. Aim for a small surplus of about 1,500 to 2,000 kJ a day, gain slowly, take creatine and protect your sleep. Here is how to plan a winter bulk in Australia, with live prices on the supplements that help.

Winter bulk at a glance

Why the cooler months suit a lean bulk

No summer deadline. Most people want to feel leaner in summer. A bulk from June to August leaves September and October to hold your new weight, then early summer to lean out if you want to. You are not trying to gain muscle and look shredded in the same months.

Appetite, but only a little. In a study of 593 adults in the United States, people ate about 86 Calories (about 360 kJ) a day more in autumn than in spring, and body weight peaked in winter (Ma and colleagues, 2006). The changes were small, about half a kilo across the year, so the cold will not do the work for you. Warm meals such as porridge, stews and pasta bakes can still make an extra serve feel natural.

Training indoors. Cold, dark mornings push most training into the gym, where conditions are the same all year, so it is easier to lift consistently. If you play winter sport such as footy, soccer or netball, you will burn more energy than someone who only lifts, so you may need more food to gain.

The catch: baggy jumpers. Winter clothes hide fat gain, so track the scales and your waist rather than the mirror.

How big should your winter surplus be?

A review led by Gary Slater of the University of the Sunshine Coast and the AIS suggests a conservative surplus of about 1,500 to 2,000 kJ a day, roughly 360 to 480 Calories, to keep fat gain down (Slater and colleagues, 2019). Sports Dietitians Australia (SDA) suggests adding energy in small steps, through three main meals and several snacks, including before and after training.

To find your number, weigh yourself three or four mornings a week and use the weekly average. If the average climbs faster than your target, cut back a little. If it has not moved for two to three weeks, add a small snack. Our bulking diet plan shows how to build meals around this.

What a realistic winter looks like

SDA says gains of 0.25 to 0.5 kg a week are possible at first when training, food and recovery are all in place, and that genetics and training history change this. Over a 13-week winter, that is roughly 3 to 6.5 kg at the very most, and it is a ceiling for beginners, not a promise. Some of it will be fat, not muscle. If you start creatine, the scales may also jump by up to 1 to 2 kg early on, mostly extra water in muscle, according to the AIS.

Gainer or homemade shake?

A shake is the easiest way to add energy when your appetite runs out. SDA notes that homemade shakes can give a similar nutrient mix to commercial products at a fraction of the cost. A gainer costs more, but it is quick, measured and easy to carry.

One serve of R1 Clean Gainer is already a little more than 2,000 kJ, and a full serve of Serious Mass is more than double it. On a lean winter bulk, use a gainer in place of a snack you would otherwise skip, or start with a half serve. For a warm option, make porridge with milk and stir in a scoop of whey once it has cooled a little. Compare more options in our best mass gainer guide, browse all weight gainers, or read our CBUM vs Serious Mass vs Mass Tech Extreme comparison.

Creatine, sleep and vitamin D

Creatine: start in May

The AIS creatine fact sheet links creatine taken with resistance training to more strength and lean mass, and describes a daily dose of 3 to 5 g. Taken that way, muscle creatine tops up over about 4 weeks, so starting in May means you are fully loaded by June. Legit Creatine Monohydrate 500 g gives 100 serves of 5 g for $49.95, about three months. If you start in May and bulk through August, the 1 kg bag (200 serves, $79.95) covers the whole stretch at about $0.40 a serve. See the full creatine range or our best creatine guide.

Sleep: use the long nights

In a small study of 13 young adults at Deakin University, one night without sleep lowered muscle protein building by 18% (Lamon and colleagues, 2021). One night is not a whole bulk, but it suggests poor sleep works against you. Winter evenings make an earlier, regular bedtime easier.

Vitamin D: a short note

When the UV Index falls below 3, which happens in parts of southern Australia in late autumn and winter, Cancer Council Australia suggests spending time outdoors in the middle of the day with some skin uncovered. Training indoors all winter can mean very little sun. If you are worried about your levels, talk to your GP, who may suggest a blood test or a supplement. If you do take one, stick to the label dose and check with your GP before taking more than 25 mcg (1,000 IU) a day. Our vitamin D guide has more detail.

Our pick: a simple winter bulk plan

• May: start creatine at 3 to 5 g a day, such as Legit Creatine Monohydrate 1 kg.
• June to August: eat about 1,500 to 2,000 kJ a day above maintenance, keep training consistently and check your weekly average weight.
• If your appetite stalls: add a homemade shake or a serve of R1 Clean Gainer. Save Serious Mass for true hard gainers, and start with half a serve.
• Every night: protect your sleep, and get some midday sun when you can.
• September: hold your new weight through spring before any summer cut.

How our price compares

Here is what the same products cost at other Australian supplement stores, so you can check the difference yourself.

Supps247 prices come from our website. Other prices were checked on the websites of Nutrition Warehouse, Australian Sports Nutrition (ASN), Elite Supps and Supplement Mart on 29 October 2026 (same product and size, price for one unit) and can change at any time. Sale means it was on sale that day. Some flavours means that price was for some flavours only. Not listed means we could not find that exact product on their site. Other sizes only means they sell it in a different size. Supps247 members can use our Price Match Guarantee against Nutrition Warehouse, ASN, Elite Supps and Supplement Mart: we beat their full price by 5% or match their sale price (conditions apply).

Shop the products in this guide

R1 Clean Gainer 30 serves$174.95ON Gold Standard Pro Gainer 5 lb$153.95ON Serious Mass 6 lb$98.95Legit Creatine Monohydrate 1 kg$79.95

Browse all weight gainers and creatine.

FAQs

Is winter the best time to bulk?

For many people in Australia it is the most practical time. Winter does not make muscle grow faster, but you are usually training indoors, there is no summer cut to plan around, and a slow bulk from June to August leaves spring to settle at your new weight. Any season works if you can train consistently and eat a small surplus for several months.

How much weight should I gain on a winter bulk?

Sports Dietitians Australia says gains of 0.25 to 0.5 kg a week are possible at first when everything is in place, and that genetics and training history matter. Over a 13-week winter, that is roughly 3 to 6.5 kg at the most for a beginner, and less if you have trained for years. Some of that will be fat and water, not just muscle.

How many extra kilojoules do I need on a winter bulk?

A review led by Gary Slater of the University of the Sunshine Coast and the AIS suggests about 1,500 to 2,000 kJ a day above maintenance, roughly 360 to 480 Calories, to limit fat gain. If your weight climbs faster than about 0.5 kg a week, trim back. If it stalls for two to three weeks, add a small snack.

Should I use a mass gainer or make my own shake?

Either works. Sports Dietitians Australia notes that homemade shakes can give a similar nutrient mix at a fraction of the cost. A gainer is quicker and easier to measure. Many gainer serves are bigger than a lean bulk surplus on their own, so use one in place of a snack, or start with a half serve and adjust from there.

When should I start creatine for a winter bulk?

Start in May. The AIS creatine fact sheet says a daily dose of 3 to 5 g tops up muscle creatine over about 4 weeks, so you will be fully loaded by June. The AIS also describes a faster loading phase of about 5 g four times a day for about 5 days. Either way, expect the scales to rise by up to 1 to 2 kg, mostly water.

Sources: Slater et al. 2019, energy surplus and muscle hypertrophy (Frontiers in Nutrition); Sports Dietitians Australia: Increasing muscle mass fact sheet; Ma et al. 2006, seasonal variation in food intake and body weight (Eur J Clin Nutr); AIS Sports Supplement Framework, Group A (creatine fact sheet); Lamon et al. 2021, sleep deprivation and muscle protein synthesis (Physiological Reports); Cancer Council Australia: vitamin D; product labels and brand nutrition panels, checked October 2026.

Order online with Australia-wide delivery, free on orders of $99.99 or more, with Afterpay available at checkout. You can also use click and collect at a store that offers it, or visit a Supps247 store in Melbourne, regional Victoria or Brisbane to compare products in person. Members can use our member price match on full-priced items.

Prices and stock were checked on 29 October 2026 and can change at any time. Always read the label and follow the directions for use. If you have a medical condition, are pregnant or take regular medication, check with your doctor first.