Minnesota · Boreal Forest & Shield · hardiness zone 5a
Now
13°C · Drizzle
Today
17° / 6°
Rain, 7 days
18 mm
Season
Fall · frost in ~38 d
Wind shift and a drop in pressure — stake, tie in, and pick anything ripe before it arrives.
Writing your field guide — reading the forecast, the moon and the map…
Overhead · Duluth, Minnesota
The two clocks nothing on the ground can argue with: the length of the day, and the phase of the moon.
The sun
12h 35m of light
Sunrise
06:46
Solar noon
13:03
Sunset
19:20
A month from now the day will be 1h 39m shorter. Enough light for steady growth.
Right now · Duluth, Minnesota
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.
13.1 °C soil · 17.7 mm
Warm and damp: the fastest decay of the year. Compost cooks, leaf mould breaks down, worms work the surface — and mushrooms fruit two to seven days after a soaking rain.
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.
17.7 mm / 7 days
17.7 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 38 days to the average first frost (Oct 22).
Next moons
38 days
Average first fall frost is around Oct 22. Nothing you sow now will finish unless it beats that.
The hard edge of the growing season. Ice inside a leaf ruptures its cells — one night ends a tomato and sweetens a parsnip.
13.1 °C
Good for brassicas, beets, chard, carrots and potatoes. Wait on the heat crops.
Seeds read soil temperature, not the calendar. Six centimetres down is where the decision gets made.
12h 35m
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 Duluth · 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.

69 records within 40 km this month

57 records within 40 km this month

Dangerous look-alike31 records within 40 km this month
Dangerous look-alike19 records within 40 km this month

16 records within 40 km this month
Dangerous look-alike13 records within 40 km this month

12 records within 40 km this month

11 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
14 species on our hazard list have been recorded near here this month, 8 of which can kill a healthy adult. Learn these before you learn anything you intend to eat.
Actaea pachypoda
Actaea rubra
Convallaria majalis
Next
Coming into season in the next month or two near Duluth, Minnesota. Seasons shift a week or two with the weather, so treat these as things to keep an eye on rather than dates.
birch polypore
Fomitopsis betulina
42 records nearby
common puffball
Lycoperdon perlatum
17 records nearby
Plants
Photographs and records from iNaturalist, used under their open licences and credited to their photographers.
Taxus canadensis
Galerina marginata
Paxillus involutus
Lepiota (the whole genus)
Amanita bisporigera
Solanum dulcamara
Amanita muscaria
Arisaema triphyllum
Tricholoma equestre
Rhamnus cathartica
Ranunculus (the whole genus)
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.