Summary

Peak season changes parcel shipping in two ways: carrier surcharges grow more complex and shift on a rolling basis, and customer expectations for on-time delivery rise even as capacity tightens. This first article in the series explains why peak season is different for parcel shipping and how to protect delivery performance through diversifying carriers, using conservative order cutoffs, optimizing packages, and stress-testing fulfillment.

Key takeaways

• Peak surcharges are complex and constantly moving. UPS and FedEx apply demand surcharges that change in both amount and timing through the season, so the cost to ship the same package can change week to week.
• Diversify your carrier mix before you need to. Adding regional and alternative carriers, along with USPS, spreads risk, opens capacity, and gives you a fallback during the highest-surcharge weeks — and onboarding takes longer than most teams expect. Compare transit time and price.
• Get the operational safeguards in place well before October. Set conservative order cutoff dates and communicate them clearly, audit packaging and labeling to avoid handling surcharges, and stress-test fulfillment for peak-day volume spikes.

The effect of peak season on logistics

It's not too early to think about peak shipping season. For many e-commerce companies, what happens in Q4 decides the financial outcome of the entire year. Peak season, roughly October through mid-January, brings a surge in order volume for most retailers, stressing every part of their supply chain. However, the planning and work required to be ready for it need to start much sooner.

The good news is that your logistics operations face similar challenges every year and on a predictable schedule. So, you have a good idea of what's coming. As carriers add surcharges and capacity tightens, customer expectations for fast, accurate delivery rise in kind. Here is also where the problems start. Companies that treat peak season as a scaled-up version of a normal month end up with missing delivery windows, above-budget freight bills, and frustrated customers. Companies that prepare the right way come out the other side with their margins and their reputations intact.

Peak-season success often hinges on three interconnected supply chain functions:

• Parcel shipping operations

• Inventory demand planning

• Freight invoice accuracy

A weakness in any one of these undermines the other two. For example, a company can forecast demand perfectly and still fail customers if its carriers cannot deliver on time. It can also build an 'optimal' shipping strategy and still lose money if it never checks whether its freight invoices are accurate when surcharges at this time of year are so nuanced. The companies that handle peak season well understand how all three operations need to work together.

This is the first article in a three-part series on preparing for peak season. This part focuses on parcel shipping operations: why costs behave differently once peak begins and how to protect on-time delivery. The two parts that follow build on it:

• Part 2 covers inventory positioning, demand forecasting, and invoice auditing — the planning and accuracy work that shipping operations depend on.

• Part 3 brings it together into a step-by-step readiness checklist you can work through before the season starts.

Why is peak season different for parcel shipping?

The most notable impact on companies' shipping costs during peak is that some small parcel carriers (primarily UPS and FedEx) take the opportunity to apply complex demand surcharges. The additional surcharges can change in their amount and when they are applied during peak season in ways that make tracking or even understanding what a given company needs to pay becomes challenging. The impact of layering surcharges on top of elevated volume that has not been properly planned for can see freight costs run 15 to 40 percent over budget by the time the season ends.

Adding to the confusion, these surcharges also change on a rolling basis. Carriers frequently update surcharge tables, add new accessorial fees, shift dates, and include complex volume tiers that all affect costs. Your cost for the same package in September can be completely different by Black Friday. That volatility is exactly why invoice auditing becomes so important during this period.

Maintaining delivery performance

The most visible peak season failure is late delivery because it is the one customers remember. And just like preparing to understand which surcharges you'll be paying, figuring out how to maintain on-time delivery performance starts well before October.

It's worth getting right: a 2024 McKinsey consumer survey found shoppers now rank on-time arrival above raw costs, and would rather wait a little longer than have an order show up late.

The primary way to ensure delivery is to diversify your carrier mix rather than rely on a single carrier. And, it doesn't have to be a UPS vs. FedEx decision. Regional, alternative carriers — and USPS — often have more available capacity and lower surcharges than the two largest national carriers during peak weeks. A multi-carrier strategy also gives a company leverage and a fallback if one carrier hits a service disruption.

An important note: carriers do not all offer the same transit times. A 1-day Ground delivery with one carrier may take 2 days with another. This means carriers should be compared on transit time and price. Keep in mind, companies also need to communicate order cutoff times clearly and set them conservatively. It's common for companies to wait too long to publish updated "order by" dates for guaranteed holiday delivery, which creates a wave of last-minute orders that a logistics network cannot reliably move in time.

Packaging and labeling optimization also matter more during peak season, since additional handling surcharges are frequently triggered by boxes that are oversized, poorly packed, or mislabeled. A packaging audit in late summer, well before volume ramps up, can meaningfully reduce these fees.

Finally, companies should stress-test their fulfillment operations, whether in-house or outsourced, for the volume spikes associated with Black Friday, Cyber Monday, and the final week before Christmas. Warehouse labor, pick-and-pack throughput, and dock scheduling all need a plan for days when order volume can be three to five times normal.

Getting parcel shipping right is the foundation of a strong peak season, and it works best when it includes accurate forecasting and clean invoices. Lock in your carrier strategy and delivery safeguards now, while there is still time to onboard carriers and audit packaging, and the October surge will look far more like a plan than a scramble.

Next: Forecasting and auditing

After getting parcel shipping right, learn how to sharpen demand forecasting, position inventory ahead of the surge, and build an invoice auditing process that catches costly surcharge and billing errors before they add up. That’s coming up in Part 2 of this blog series.

Carriers negotiate with your data. TransImpact helps you negotiate with theirs. Check out this free insider's guide to parcel contract negotiations and get ready for peak season.

FAQs

When should I start preparing for peak shipping season?

Earlier than most teams expect. Peak runs roughly October through mid-January, but the work that protects your costs and delivery performance needs to happen in late summer. Onboarding a new carrier in particular takes more time than most companies plan for.

Why do parcel shipping costs rise during peak season?

The biggest driver is demand surcharges from carriers such as UPS and FedEx, applied on top of normal rates during the busiest weeks. These surcharges change in both amount and timing on a rolling basis, so the cost to ship the same package can be different in September than it is on Black Friday.

How can I protect on-time delivery during the holiday rush?

Start by diversifying your carrier mix rather than relying on a single national carrier. Compare carriers on transit time and price, set conservative order cutoff dates and communicate them clearly, and stress-test your fulfillment operation for peak-day volume. Optimizing packaging ahead of the season also helps avoid handling surcharges.