How to Harvest Keywords From Amazon Auto Campaigns (Step by Step)

To harvest keywords from an Amazon auto campaign, download the search term report, pick the search terms that have converted at or below your target ACoS, add them as exact match keywords in a manual campaign, and add them as negative exact in the auto campaign. This moves proven searches into a campaign where you control the bid, while the auto campaign keeps looking for new ones.

Harvesting is the bridge between discovery and scale. An auto campaign is good at finding searches, but you can only set bids at the targeting group level. Once a search term has proven itself, it deserves its own bid.

Why harvest at all?

• Bid control. In an auto campaign, one bid covers every search in a targeting group. In exact match, each keyword gets its own bid based on its own performance.
• Cleaner data. A harvested keyword has its own row in reports, so you can see its trend over time instead of digging through search terms.
• Budget priority. Your proven terms no longer compete for the same budget as untested discovery traffic.
• Placement control. You can raise top-of-search adjustments in a campaign full of proven winners without paying more for unproven auto traffic.

Step 1: Give the auto campaign enough time

Let a new auto campaign run for at least 10 to 14 days before your first harvest, and longer for low-traffic products. Remember that Sponsored Products uses a 7-day attribution window for sellers, so the most recent days are still filling in. Use a 30-day report window once you have that much data.

Step 2: Download and filter the search term report

Create a Sponsored Products search term report in the Ads console (see the search term report guide for the exact steps). Filter it to your auto campaign, then separate keyword search terms from ASIN search terms. ASINs start with 'b0' and belong in product targeting, not keyword harvesting.

Step 3: Apply harvest thresholds

Use clear rules so you harvest consistently every week. These are sensible starting thresholds; adjust them to your traffic levels.

Low-traffic products may never reach 2 orders per term in 30 days. In that case, use a 60-day window or accept 1 order with strong relevance.

Step 4: Choose where harvested keywords go

Most sellers keep one manual exact campaign per product (or product group) and add harvested keywords there. Some put each high-volume keyword in its own ad group or campaign for maximum control. Both work; the key is consistency. For structure options, see Amazon PPC campaign structure.

Many sellers also add the harvested term as phrase match in a phrase campaign. That lets you discover longer variations of a proven phrase. If you do, keep the phrase bid lower than the exact bid.

Step 5: Set the starting bid

Start from what the term actually cost in the auto campaign, then adjust toward your target ACoS. A simple formula: new bid = average CPC x (target ACoS / actual ACoS). Cap any increase at about 30% for the first change so you don't overshoot.

Worked example

Your auto campaign shows the search term 'collapsible dog water bowl' with 38 clicks, $26.60 spend ($0.70 average CPC), 5 orders, and $99.75 in sales. ACoS is 26.7%. Your target is 30%.

• Bid formula: $0.70 x (30 / 26.7) = $0.79.
• Add 'collapsible dog water bowl' as exact match in your manual exact campaign at $0.79.
• Add 'collapsible dog water bowl' as negative exact in the auto campaign.
• Optionally add it as phrase match in your phrase campaign at around $0.60 to find longer versions.

If the same term had an ACoS of 38%, the formula gives $0.70 x (30 / 38) = $0.55. You still harvest it, but at a lower bid, because exact match lets you buy it at the right price.

Step 6: Negate in the source campaign

This step is what makes harvesting work. If you skip it, the auto campaign keeps competing for the same search, and you won't know which campaign Amazon will serve. Use negative exact, not negative phrase, so the auto campaign can still find longer variations. Why that matters is covered in negative exact vs negative phrase, and the full approach in keyword isolation.

Step 7: Watch the harvested keyword for two weeks

A harvested keyword doesn't always behave the same in exact match. Sometimes it gets more impressions because your exact bid is higher; sometimes fewer. Check after one and two weeks:

• Few or no impressions: your exact bid may be below what the auction requires. Raise it 10% to 20%.
• Impressions and clicks but lower conversion than in auto: check placement. Top-of-search and product page traffic can convert differently.
• Performing as expected: leave it and let your normal bid rules manage it.

Harvesting ASINs, too

The same process applies to ASIN search terms. When a competitor's product page converts well for you in the auto campaign's substitutes or complements groups, add that ASIN to a product targeting campaign and add it as a negative product target in the auto campaign. See Amazon product targeting by ASIN.

Common harvesting mistakes

• Harvesting on one lucky order. A single sale can be noise. Unless the term is an obvious fit, wait for a second order.
• Copying the auto campaign's CPC as the exact bid without checking ACoS. A term that converted at 45% ACoS needs a lower bid, not the same one.
• Harvesting branded searches for your own brand into a generic exact campaign. Put them in a separate brand campaign so they don't flatter your generic ACoS.
• Never cleaning up. If a harvested keyword stops converting for a month, lower its bid or pause it, just like any other keyword.

How often should you harvest?

Weekly for active products, every two weeks for slow sellers. The routine takes 15 to 30 minutes per product with a spreadsheet. AdSpark's AI search-term review runs the same harvest-and-negate logic automatically and logs every change so you can reverse it, which helps when you have dozens of products.

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