Enter the materials you actually have to estimate C:N ratio, moisture, loose pile volume, source-range sensitivity, and possible corrections—then record heat, probe coverage, turns, curing, and lessons in one numbered batch record.
Only need a private record without the mix calculation and management workflow? Open the simpler Compost Temperature Log.
Start with the information you have. Typical published values are already labeled as estimates, and Advanced accuracy remains optional until you have measured moisture, laboratory carbon and nitrogen, or a bucket-density test.
Name the batch, select turned, passive, tumbler, or aerated-static management, and choose the pile you want to build.
Use one row per material. Weight gives the stronger estimate, but compatible volume units can be mixed in the same batch.
Check C:N, moisture, source-range sensitivity, loose volume, structure, heat-retention context, and any correction alternatives together.
Open Manage & log to record temperatures, probe positions, moisture, odor, actions, responses, curing, and the lesson for the next batch.
Create or open a saved batch to begin its management log.
Record the pile temperature and probe position.
Record temperature, moisture feel, odor, and probe position to receive a combined management check.
Select and save a batch to see method-specific guidance.
No observations recorded. A backyard log is not certification.
Pile and ambient temperatures are shown together when both are recorded. Action markers help evaluate whether a correction produced the intended response.
No observations recorded yet. Add the first temperature check to begin the trend.
During rapid heating, check at least daily when actively managing a hot pile or documenting a sanitation process. Passive piles can be checked less often. Use consistent locations and times so the trend means something.
Check the center plus an outer, side, or lower location. A single hot reading does not show whole-pile coverage.
Wear gloves. Material should feel like a wrung-out sponge; a firm squeeze may produce only a drop or two. The dry surface alone is not representative.
If dry, add water gradually while turning or mixing so it is distributed. If wet or dripping, stop adding water, protect the pile from excess rain, and restore air with dry coarse browns and method-appropriate aeration.
Turn or aerate for excessive heat, sour odor, compaction, poor oxygen, uneven zones, or a substantial temperature decline while unfinished material remains. Move cooler outer material through the active center.
Visible fungal growth can support a dated observation but does not measure fungal biomass or prove beneficial function. Earthworms are generally expected only in cooler zones or curing compost; their absence from a hot active center is not a failure.
No reheating supports a curing decision only when the pile is adequately moist. A dry pile can appear inactive before decomposition is complete.
| Date | Pile temp | Ambient | Probe | Moisture | Odor | Biology observed | Rain | Action / quantity | Response | Notes | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| No observations recorded. | |||||||||||
Open, update, print, back up, restore, or remove a record. Clearing browser data or changing devices can remove records that were not downloaded.
The release compares international regulations, official guidance, landmark studies, recent trials, and prominent calculators. Regulations are shown as examples—not silently converted into a universal backyard rule.
Microbial activity produces heat, while the pile surface loses it. A roughly 3–5 ft pile commonly retains heat more efficiently than a small heap while remaining manageable and aerated. Smaller piles can still compost, but they may not sustain hot-pile temperatures.
Illinois Extension sourceMicrobes create heat while decomposing accessible ingredients. C:N is only one part of the process: moisture, oxygen-filled pore space, particle size, thorough contact between materials, pile mass, and weather also control whether production exceeds heat loss. Diagnose the whole system before adding more nitrogen.
Use the science-based not-heating diagnostic
Cornell moisture and mix sourceA center reading shows what happened at the probe, not throughout the entire pile. High-temperature sanitation claims require time, coverage, turning, and documentation. A backyard record should not be represented as regulatory certification.
Penn State sourceMany sanitation protocols begin at 55°C / 131°F, yet peer-reviewed studies found microbial activity or diversity declined substantially above about 55–60°C / 131–140°F. Productive decomposition and sanitation are related goals, not the same target.
Applied and Environmental Microbiology studyA rapid pile commonly performs best near 50–60% moisture. A squeeze test is a field screen—not a laboratory measurement: an interior handful should feel like a wrung-out sponge and release no more than a few drops. Correct dry or wet zones while mixing so one center reading is not mistaken for the whole pile.
Use the wet-compost symptoms and corrections guide
Utah State University Extension sourceUniversity schedules differ because pile size, method, weather, ingredients, moisture, oxygen, and sanitation goals differ. Use temperature trend, moisture, odor, structure, and unfinished material together. Forced-air static piles and passive piles should not inherit a turned-windrow schedule.
Use the temperature-based turning decision guide
Oregon State University Extension sourceUS windrow rules commonly use 55°C / 131°F for 15 days with five turns. EU fertilising-product rules allow several time–temperature combinations and require all material to be moved or forced-ventilated. Neither can be proven from one probe reading.
EU regulation sourceTreated grass, hay, straw, and manure can carry aminopyralid, clopyralid, or picloram into compost and damage broadleaf plants. Know the source and use a pea or bean bioassay when uncertain.
US EPA sourceFungi help decompose resistant plant compounds and participate in aggregation and nutrient cycling. Woody habitat and curing can support fungal activity, but “fungal dominant” cannot be guaranteed from a recipe. Actual biomass requires suitable measurement.
Recent microbiome evidenceWhen turning no longer restores heat, decomposition continues at lower temperature. Curing allows unstable compounds to be transformed and reduces the risk of applying immature compost around roots.
Cornell compost stagesCompost can release nutrients gradually for years, but release varies widely and it is not automatically a complete fertilizer. Soil testing, compost analysis, crop demand, climate, and application rate still matter.
Colorado State source