What "acceptable growing stock" means in Current Use

Vermont's Current Use program saves landowners real money on property taxes, but that savings comes with a condition that's easy to overlook when you enroll: your woodland has to maintain what the state calls "acceptable growing stock."" Fail to meet that standard, and you risk losing your enrollment - or being required to carry out corrective work before your next review cycle.

This post unpacks what the phrase actually means, where borderline parcels run into trouble, and what you can do to stay on solid footing.

The phrase sounds simple - the definition is not

"Acceptable growing stock" is a technical term borrowed from commercial timber management. In Vermont's Current Use context it refers to the trees in your forest that are capable of producing wood products of commercial value over a normal rotation. The Vermont Department of Taxes and the Department of Forests, Parks and Recreation (FPR) use the concept together to evaluate whether an enrolled parcel is being managed in a way that is consistent with good forestry practice.

What that means on the ground is that your forest must contain enough healthy, well-formed trees of appropriate species to be considered productive. A parcel blanketed in low-grade, defective, or diseased stems that will never yield merchantable timber is not meeting the standard, even if it looks like a "forest" from the road.

In practice, the standard appears to involve more than simple tree count, including stocking, species, and tree form. Stocking - the density of trees relative to the site's carrying capacity - matters. Species composition matters. The vigor and form of individual trees matters. A stand of wolf trees, heavily forked stems, and persistent epicormic branches covering a hillside in Marlboro or Wardsboro may be fully stocked by tree-count, but it can still fall short of acceptable growing stock if those trees offer little realistic path to a commercial product.

Why "borderline" matters more than "clearly failing"

A woodlot that has been stripped of every saleable tree obviously fails the standard. Reviewers rarely debate those cases. The difficult cases - the ones that consume the most time and occasionally end in appeals - are the borderline ones.

A borderline parcel is one where:

• The stand has been high-graded in the past, leaving a residual crop of low-vigor co-dominant trees that are technically alive but unlikely to produce valuable wood.
• A significant portion of the basal area is tied up in species with limited local markets, such as eastern hophornbeam or striped maple, at the expense of more productive species.
• Beech bark disease has killed or deformed the beech component, and no remediation work has been done to redirect growth to healthier species. (If you have beech on your land, the TSI and beech bark disease priorities for Windham County post covers the treatment options in detail.)
• Hemlock stands are thinning due to hemlock woolly adelgid pressure, and the understory has not been released to replace that canopy.
• The parcel has a low site index - poor soils, shallow depth to ledge, or persistent wetness - and the stand has never been managed to optimize what the site can actually produce.

In each of these situations, a forester reviewing the parcel could reasonably go either way. That subjectivity is exactly why having a current, well-written forest management plan is so important. The plan documents your management history, explains the site constraints, and lays out a credible path forward. Without it, you are relying on the reviewer's in-the-moment judgment with no context to support a favorable reading.

What the state actually looks at during a review

Vermont's Current Use reviews are not random. They are often triggered by:

• A timber harvest conducted without proper notification or a harvest that appears inconsistent with the management plan on file.
• A complaint from a neighbor or a town official.
• A change in ownership that prompts a closer look at the parcel's condition.
• Aerial or satellite imagery that suggests recent heavy disturbance.

When a reviewer visits, they are looking at the forest in its current condition against the management plan. They will assess the stocking of acceptable growing stock, the distribution of that stocking across the parcel, and whether recent management activities (or the lack of them) are consistent with the plan's schedule.

One thing that catches landowners off guard: the standard applies to the whole enrolled parcel, not just the productive sections. If you have a back forty that is productive sugar maple and a front twenty that has been neglected and gone to brush and low-grade stems, the front twenty still counts. A forester can help you decide whether areas that are genuinely incapable of meeting the standard should be carved out of the enrollment boundary rather than left to drag down your status.

For a broader picture of the challenges specific to this region, some Windham County parcels are structurally harder to keep in Current Use than others, and that post explains several of the site-level reasons.

The role of your forest management plan

A forest management plan is not decoration. Under Vermont's Current Use rules, an enrolled parcel of forest land must have an approved management plan on file, and that plan must be the work of a licensed consulting forester. The plan describes the current condition of the forest, the management objectives, and the specific activities (harvests, TSI, invasive control) that will be carried out over the plan period.

Where acceptable growing stock becomes relevant is in the plan's prescriptions. A good plan does not just inventory what is there. It prescribes what needs to happen to move the stand toward a higher-quality condition. If your stand is borderline today, the plan should acknowledge that honestly and lay out a realistic treatment schedule.

This matters during a review because a reviewer who finds a borderline stand and sees an active plan with a credible treatment schedule in the near term is in a very different position than one who finds a borderline stand with no plan or a plan whose scheduled treatments are years overdue. The former can be noted as "in progress." The latter is harder to defend.

Our consulting forestry and forest management plan services are built around exactly this kind of situation - parcels where the condition is real, the path forward is achievable, but the documentation needs to be clear and defensible.

TSI as the primary tool for borderline stands

Timber Stand Improvement (TSI) is the main prescription foresters use when a stand is carrying too much unacceptable growing stock. TSI involves removing low-grade, defective, or competing stems to release the better trees, concentrate the site's resources on the most productive individuals, and move the stand measurably toward a higher-quality condition.

TSI does not always generate revenue. In many borderline stands, the stems being removed are not worth cutting for lumber or even firewood in the commercial sense. The work may be done with a chainsaw and left to rot, or cut for personal firewood use. The economic return comes later, when the crop trees that were released grow more rapidly and accumulate value.

If you want to understand when TSI is the right tool versus a commercial timber sale, the post on TSI cuts vs. timber sales - which tool fits your woodlot walks through the decision in practical terms.

The key point for Current Use purposes is that documented TSI work is evidence of active management. A parcel that has had a TSI entry within the last plan period, with the work recorded and consistent with the plan's prescription, is in a much stronger position during a review than one where nothing has happened.

Species composition and why it matters

A common situation in Windham County woodlots - from the hillside farms around Grafton and Athens to the steeper terrain above Jamaica and Townshend - is a residual stand dominated by species that have limited value in today's regional timber markets. American beech (especially beech with bark disease), striped maple, and pin cherry may be native and ecologically present, but heavy dominance by these species at the expense of sugar maple, yellow birch, white ash, or red oak can push a stand toward the borderline.

Species composition is generally understood to be one factor foresters weigh when assessing acceptable growing stock. This is not a simple cutoff, and the site's natural potential matters. A wet flat in Brookline that naturally grows silver maple and black ash is different from a well-drained south-facing slope in Halifax that should be carrying red oak and hickory but is covered in low-grade beech.

What you should take away from this: if your woodlot has a significant proportion of non-commercial or low-commercial species, your management plan needs to address that directly. The plan should show a trajectory toward a better composition, even if that trajectory takes multiple plan periods.

Stocking standards and what "understocked" means

Stocking levels are generally considered part of what determines acceptable growing stock under the program. A stand that is severely understocked - too few trees per acre to be meaningfully productive - may not meet the standard even if the individual trees present are healthy and well-formed.

Understocking can result from:

• Past heavy harvests that removed too much volume and left gaps the residual stand cannot close quickly.
• Repeated deer browse pressure on regeneration, particularly in areas with high deer populations across southern Vermont.
• Wind or ice damage that opened the canopy without triggering regeneration of acceptable species.
• Conversion of former agricultural land to forest that has stalled in an early-successional shrub phase.

If your parcel is understocked, your management plan should address the cause and the treatment. Planting is sometimes appropriate. More often, the prescription involves protecting natural regeneration by fencing, browse tubes, or managing competing vegetation. The plan needs to show that you understand the problem and are taking steps to correct it.

What happens when a parcel is challenged

If a reviewer concludes that your parcel is not meeting the acceptable growing stock standard, the outcome is not always immediate disenrollment. In practice, Vermont's process often involves a notice to the landowner, a chance to respond, and sometimes a corrective action period to show management work has been done or planned, though you should confirm specifics with the Department of Taxes.

This is where a forester's involvement is invaluable. A forester can respond on your behalf, clarify the condition, document the treatment history, and if necessary amend the management plan to reflect the current situation. Per Vermont FPR guidance, plan amendments are sometimes required when conditions change materially, and understanding when those amendments are mandatory can help you stay ahead of problems rather than reacting to them.

If you are purchasing a parcel that is already enrolled in Current Use, it is worth having a forester walk the land before closing. A pre-purchase review will tell you whether the existing enrollment is on solid footing and what management work, if any, you will be inheriting. The post on buying wooded land in Grafton or Athens - questions to ask first covers the broader due-diligence checklist for that kind of purchase.

Practical steps for landowners in Windham County

If you are enrolled in Current Use and are uncertain whether your forest meets the acceptable growing stock standard, here is a straightforward sequence:

• Get a forester on the land. A licensed consulting forester can assess your stand honestly against the standard and tell you where you stand before a state reviewer does.
• Review your current management plan. Is it current? Is the treatment schedule being followed? If prescriptions are overdue, document what happened and whether conditions have changed.
• Prioritize TSI in borderline areas. Even modest TSI work, properly documented, demonstrates active management and moves your stand in the right direction.
• Consider amending your plan if the stand condition has changed materially since the plan was written.
• Do not wait for a notice. A proactive approach is always less stressful and less expensive than a reactive one.

We work with landowners across Newfane, Townshend, Jamaica, Windham, Marlboro, Halifax, Grafton, and Athens, among other towns throughout southern Vermont. If you have questions about your specific parcel, the FAQ page covers many of the most common Current Use questions, and you are always welcome to reach out directly for a conversation about your land.

Understanding what acceptable growing stock actually means - not just as a phrase but as a practical standard applied to your specific forest - is the foundation of keeping your Current Use enrollment on solid footing for the long term.

Revision history (1)

• Sep 17, 2026 - Pre-publish editorial QA: 1 flagged, 1 softened; claim audit: 7 claims, 4 rewritten

Claim-by-claim audit (7 checked)

• “Fail to meet that standard, and you risk losing your enrollment - or being required to carry out corrective work before your next review cycle.” (cited → tax.vermont.gov)
• “Under Vermont's Current Use rules, an enrolled parcel of forest land must have an approved management plan on file, and that plan must be the work of a licensed consulting forester…” (cited → tax.vermont.gov)
• “In practice, Vermont's process often involves a notice to the landowner, a chance to respond, and sometimes a corrective action period to show management work has been done or plan…” (rewritten to what the article can stand behind)
• “Plan amendments may be needed when conditions change materially, so it's worth checking with your forester about when an amendment is advisable.” (rewritten to what the article can stand behind)
• “Species composition is generally understood to be one factor foresters weigh when assessing acceptable growing stock.” (rewritten to what the article can stand behind)
• “Stocking levels are generally considered part of what determines acceptable growing stock under the program.” (rewritten to what the article can stand behind)
• “In practice, the standard appears to involve more than simple tree count, including stocking, species, and tree form.” (rewritten to what the article can stand behind)