Soil sampling requirements in Oregon

Q: How often do you need to soil sample in Oregon?

Oregon State University Extension sampling advice (official guidance): Every 2 to 3 years for annual crops, pastures and legumes. Every 3 to 5 years for Christmas trees, fruit and nut trees, berries and grapes.

Q: When in the year should soil be sampled in Oregon?

Oregon State University Extension sampling advice (official guidance): Same time of year each time. Western Oregon high-rainfall soils: late summer or fall. Perennial crops: before planting.

Q: How deep should soil samples be taken in Oregon?

Oregon State University Extension sampling advice (official guidance): Surface to about 6 inches (15.24 cm), or to the depth of tillage. Keep the same depth for all future samples.

Q: How many cores go into one soil sample in Oregon?

Oregon State University Extension sampling advice (official guidance): 15 to 20 subsamples per sampling area.

State guidance: Oregon State University Extension sampling advice.

Soil sampling in Oregon: frequency, area, depth and cores

How often do you need to soil sample in Oregon?

Oregon State University Extension sampling advice Official guidance Every 2 to 3 years for annual crops, pastures and legumes. Every 3 to 5 years for Christmas trees, fruit and nut trees, berries and grapes.

When in the year should soil be sampled in Oregon?

Oregon State University Extension sampling advice Official guidance Same time of year each time. Western Oregon high-rainfall soils: late summer or fall. Perennial crops: before planting.

How deep should soil samples be taken in Oregon?

Oregon State University Extension sampling advice Official guidance Surface to about 6 inches (15.24 cm), or to the depth of tillage. Keep the same depth for all future samples.

How many cores go into one soil sample in Oregon?

Oregon State University Extension sampling advice Official guidance 15 to 20 subsamples per sampling area.

Soil sampling rules in Oregon, with the exact wording of each source
Country / region	Purpose / programme	Time / frequency	Area per sample	Method	Depth	Cores	Status and source
United States
OregonUnited StatesOregon only. Other states set their own rules.	Routine soil fertility sampling for farms and gardensOregon State University Extension sampling advice	Repeat Every 2 to 3 years for annual crops, pastures and legumes. Every 3 to 5 years for Christmas trees, fruit and nut trees, berries and grapes. Season Same time of year each time. Western Oregon high-rainfall soils: late summer or fall. Perennial crops: before planting.	Not specified	A separate sample for each area that differs in soil type, topography, crop or management history. Avoid unusual spots.	Surface to about 6 inches (15.24 cm), or to the depth of tillage. Keep the same depth for all future samples.	15 to 20 subsamples per sampling area	Official guidanceOregon State University Extension, EC 628 (PDF)
Who it applies to, the exact wording and every source Who it applies to Advice for Oregon farms and gardens from Oregon State University Extension. Not law. In force from Under review Legal text Oregon State University Extension, A Guide to Collecting Soil Samples for Farms and Gardens (EC 628, revised November 2022) The wording in the source Timing In general, test every 2 to 3 years for annual crops, pastures, and legumes, and test every 3 to 5 years for Christmas trees, fruit and nut trees, berries, and grapes. Take samples at the same time of year so results are comparable from year to year. EC 628, How often should I collect a soil sample? Testing these soils in the late summer or fall allows time for these amendments to react with the soil before the following growing season. EC 628, When should I collect my soil sample? (high rainfall areas of western Oregon) the most important time to test the soil is before planting so necessary nutrients can be incorporated into the soil. EC 628, When should I collect my soil sample? (perennial crops) Method The area from which to collect a soil sample may depend on the soil type, topography, crops grown, management history, or all of the above. EC 628, Where should I collect a soil sample? Avoid sampling in small areas where you know that conditions are different from the rest of the field (for example, former manure piles, fertilizer bands, or fence lines). EC 628, Avoid unusual areas Depth For most annual and perennial crops, sample from the surface down to about 6 inches (Figure 5) or to the depth of tillage. EC 628, Take the soil sample to the correct depth Collect samples at the same depth. For example, if you take initial samples at a 6-inch depth, keep that same depth for all future samples EC 628, Take the soil sample to the correct depth Cores Each sample should consist of subsamples taken from 15 to 20 locations within the sampling area (Figure 2). EC 628, Take 15 to 20 subsamples Sources Oregon State University Extension, EC 628 (PDF) Guidance Sources re-checked every two months, last update October 2026. Reviewed by GeoPard editorial team.

United States: federal rules and every other state

Soil sampling regulations in every country

Report an outdated requirement: info@geopard.tech

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Set the area per sample, the cores and the depth your rule asks for. GeoPard places the points on a grid or by zone, routes the walk, prints the labels and takes the plan to the field on a phone.

Create a sampling plan See the Soil Sampling Planner

A planning reference built from official sources, not legal advice. Rules apply by jurisdiction, nutrient, land use and programme: check the current official text and your laboratory’s instructions before fieldwork.

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Soil sampling requirements in Oregon

Soil sampling requirements in Oregon

Soil sampling in Oregon: frequency, area, depth and cores

How often do you need to soil sample in Oregon?

When in the year should soil be sampled in Oregon?

How deep should soil samples be taken in Oregon?

How many cores go into one soil sample in Oregon?

The wording in the source

Timing

Method

Depth

Cores

Sources

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