Pennsylvania · Appalachian Highlands · hardiness zone 6b
Now
17°C · Clear
Today
21° / 16°
Rain, 7 days
13 mm
Season
Fall · frost in ~49 d
Peak photosynthesis and peak water loss. Beds dry fast and transplants sulk.
Writing your field guide — reading the forecast, the moon and the map…
Overhead · Pittsburgh, Pennsylvania
The two clocks nothing on the ground can argue with: the length of the day, and the phase of the moon.
The sun
12h 29m of light
Sunrise
07:00
Solar noon
13:15
Sunset
19:29
A month from now the day will be 1h 20m shorter. Enough light for steady growth.
Right now · Pittsburgh, Pennsylvania
Nothing here is a guess. Each of these is read from this week's forecast and this location's climate record, and each one is pushing the season one way or the other.
21.6 °C soil · 13.0 mm
Steady breakdown. Worms and fungi are moving last year's leaves into this year's soil.
Fungi and bacteria turning last season into next season's soil. The same warm, wet window that runs a compost heap also fruits the mushrooms.
13.0 mm / 7 days
13.0 mm across 3 days — short of the ~25 mm a week most beds want. Top up the thirstiest rows.
Sets the pace for everything: germination, fungal fruiting, slug nights, and how a river runs for the next three days.
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The moon
Waxing Crescent
11% lit · waxing · day 3 of 29.5
Planting by the moon: New to first quarter: sow leafy crops and anything harvested for its leaves — lettuce, spinach, brassicas, herbs.
Fishing: good — feeding peaks in the days either side of new and full, and around moonrise and moonset.
Turn of the season
Fall equinox
Sep 22 · 7 days away
About 49 days to the average first frost (Nov 2).
Next moons
194 frost-free days
Typically Apr 22 to Nov 2 here. Coldest night in the next week: 12.4 °C.
The hard edge of the growing season. Ice inside a leaf ruptures its cells — one night ends a tomato and sweetens a parsnip.
21.6 °C
Warm enough for beans, corn, squash, cucumber and transplanted tomato and pepper. Roots run hard at this temperature.
Seeds read soil temperature, not the calendar. Six centimetres down is where the decision gets made.
12h 29m
Losing about 3 minutes of daylight a day.
The one thing weather can't change. Plants count photoperiod to decide when to bolt, bulb, flower and go dormant.
Waxing Crescent · 11%
Waxing, 3 days old. Full moon in 11 days. Fishing outlook: good.
It moves water — in the sea, in a lake's edge, and, by long tradition, in the sap of a plant. Fish feed hardest on the days around new and full.
Found near Pittsburgh · September
400 species have been recorded within about 40 km of here in September, from verified public observations. These are the ones we have written up, ordered by how often they turn up.



85 records within 40 km this month

75 records within 40 km this month


72 records within 40 km this month
Dangerous look-alike47 records within 40 km this month

Dangerous look-alike27 records within 40 km this month
Recorded near you this month. We have no identification guidance for these, so treat them as a list of things to go and learn — from a regional key or someone who knows them — not as a list of things to pick.
Fungi
Your woods
The commonest trees recorded nearby, most often seen first. Most of the good mushrooms are tied to a particular tree, so this is the first thing to know about a wood.
Know these first
11 species on our hazard list have been recorded near here this month, 2 of which can kill a healthy adult. Learn these before you learn anything you intend to eat.
Actaea pachypoda
Amanita bisporigera
Next
Coming into season in the next month or two near Pittsburgh, Pennsylvania. Seasons shift a week or two with the weather, so treat these as things to keep an eye on rather than dates.
Bay Polypore
Picipes badius
115 records nearby
Plants

white snakeroot
Ageratina altissima
793 records nearby

Wingstem
Verbesina alternifolia
507 records nearby

American burnweed
Erechtites hieraciifolius
277 records nearby

great blue lobelia
Lobelia siphilitica
255 records nearby

Amur honeysuckle
Lonicera maackii
243 records nearby

common jewelweed
Impatiens capensis
205 records nearby
Photographs and records from iNaturalist, used under their open licences and credited to their photographers.
Phytolacca americana
Omphalotus illudens
Toxicodendron radicans
Solanum dulcamara
Scleroderma citrinum
Arisaema triphyllum
Hypholoma fasciculare
Chlorophyllum molybdites
Rhamnus cathartica
These are recorded within about 40 km of here in this month, from verified public observations. It is not a complete list of what is dangerous — nothing is — and a species missing from it may still be in your woods. Never eat anything identified from a photograph and a description alone.