FungRadar

Foraging forecast: Hertfordshire

Conditions in Hertfordshire in September 2026 are middling, index 50 out of 100; of the species we model, penny bun is closest to its flush. There will be something, but you will have to look: check which of the coming days reads higher and go then.

A seven-day index for the species whose records are confirmed here — 26 of them right now. Flush phases and the factors behind the number, instead of a "chance of finding" percentage we cannot measure. Data updated 18 September 2026, 11:37 BST.

The map is built from the measurement network — one point per sizeable town and more in between. A detailed 2.5 km grid is computed for one region so far: it needs its own run for every cell.

Across the region today: 45 to 56, measured at 15 stations. Among towns the highest is Hertford (56) and the lowest Stevenage (45). This is weather, not a catch: a higher number means better conditions, and the mushroom grows in one particular wood.

Biting insects: next to none. What to bring.

Best today

Penny Bun

Boletus edulis

Startingconfidence 48%

Flush phase

  1. Quiet
  2. Starting
  3. Building
  4. Peak
  5. Fading

Updated 18 September 2026, 11:37 BST

Map

Where to look: Hertfordshire

Values are computed at measurement points and interpolated between them. Clicking a point opens that town.

Open the interactive map

By species

The week, species by species

Each row is its own seven days. Today is outlined.

Penny Bun — botanical illustration

Penny Bun

Boletus edulis

Starting50 today

Week's best 50 — on Fridayaverage 46by the weekend falling

Today is as good as it gets — conditions do not improve later this week.

  1. Today5018 Sept
  2. Sat4919 Sept
  3. Sun4920 Sept
  4. Mon4821 Sept
  5. Tue4322 Sept
  6. Wed4323 Sept
  7. Thu4224 Sept
Honey Fungus — botanical illustration

Honey Fungus

Armillaria mellea

Starting42 today

Week's best 42 — on Fridayaverage 40by the weekend falling

Conditions are poor: even the week's best day only reaches «slow».

  1. Today4218 Sept
  2. Sat4119 Sept
  3. Sun4020 Sept
  4. Mon4121 Sept
  5. Tue3922 Sept
  6. Wed3823 Sept
  7. Thu3724 Sept
Weeping Bolete — botanical illustration

Weeping Bolete

Suillus granulatus

Starting47 today

Week's best 47 — on Fridayaverage 44by the weekend falling

Conditions are poor: even the week's best day only reaches «slow».

  1. Today4718 Sept
  2. Sat4719 Sept
  3. Sun4520 Sept
  4. Mon4421 Sept
  5. Tue4222 Sept
  6. Wed4223 Sept
  7. Thu4124 Sept
Oyster Mushroom — botanical illustration

Oyster Mushroom

Pleurotus ostreatus

Quiet0 today

Zero all week: this species is not fruiting now.

Velvet Shank — botanical illustration

Velvet Shank

Flammulina velutipes

Quiet0 today

Zero all week: this species is not fruiting now.

Brown Birch Bolete — botanical illustration

Brown Birch Bolete

Leccinum scabrum

Starting46 today

Week's best 46 — on Fridayaverage 42by the weekend falling

Conditions are poor: even the week's best day only reaches «slow».

  1. Today4618 Sept
  2. Sat4519 Sept
  3. Sun4320 Sept
  4. Mon4321 Sept
  5. Tue4022 Sept
  6. Wed3923 Sept
  7. Thu3824 Sept
Orange Oak Bolete — botanical illustration

Orange Oak Bolete

Leccinum aurantiacum

Starting46 today

Week's best 46 — on Fridayaverage 42by the weekend falling

Conditions are poor: even the week's best day only reaches «slow».

  1. Today4618 Sept
  2. Sat4519 Sept
  3. Sun4420 Sept
  4. Mon4421 Sept
  5. Tue4022 Sept
  6. Wed3923 Sept
  7. Thu3824 Sept
Chanterelle — botanical illustration

Chanterelle

Cantharellus cibarius

Starting41 today

Week's best 41 — on Fridayaverage 38by the weekend falling

Conditions are poor: even the week's best day only reaches «slow».

  1. Today4118 Sept
  2. Sat4019 Sept
  3. Sun4020 Sept
  4. Mon3921 Sept
  5. Tue3722 Sept
  6. Wed3623 Sept
  7. Thu3624 Sept
Lactarius resimus — botanical illustration

Lactarius resimus

Lactarius resimus

Starting40 today

Week's best 40 — on Fridayaverage 37by the weekend falling

Conditions are poor: even the week's best day only reaches «slow».

  1. Today4018 Sept
  2. Sat3919 Sept
  3. Sun3920 Sept
  4. Mon4021 Sept
  5. Tue3522 Sept
  6. Wed3423 Sept
  7. Thu3324 Sept
Saffron Milkcap — botanical illustration

Saffron Milkcap

Lactarius deliciosus

Starting44 today

Week's best 45 — on Mondayaverage 42by the weekend falling

Conditions are poor: even the week's best day only reaches «slow».

  1. Today4418 Sept
  2. Sat4319 Sept
  3. Sun4420 Sept
  4. Mon4521 Sept
  5. Tue4222 Sept
  6. Wed4023 Sept
  7. Thu3924 Sept
Bay Bolete — botanical illustration

Bay Bolete

Imleria badia

Starting49 today

Week's best 49 — on Fridayaverage 45by the weekend falling

Conditions are poor: even the week's best day only reaches «slow».

  1. Today4918 Sept
  2. Sat4819 Sept
  3. Sun4820 Sept
  4. Mon4721 Sept
  5. Tue4322 Sept
  6. Wed4223 Sept
  7. Thu4124 Sept
Sheathed Woodtuft — botanical illustration

Sheathed Woodtuft

Kuehneromyces mutabilis

Starting38 today

Week's best 38 — on Fridayaverage 33by the weekend falling

Conditions are poor: even the week's best day only reaches «slow».

  1. Today3818 Sept
  2. Sat3719 Sept
  3. Sun3520 Sept
  4. Mon3321 Sept
  5. Tue3222 Sept
  6. Wed3023 Sept
  7. Thu2924 Sept
Field Blewit — botanical illustration

Field Blewit

Collybia personata

Starting26 today

Week's best 26 — on Fridayaverage 24by the weekend falling

Conditions are poor: even the week's best day only reaches «slow».

  1. Today2618 Sept
  2. Sat2619 Sept
  3. Sun2520 Sept
  4. Mon2621 Sept
  5. Tue2422 Sept
  6. Wed2223 Sept
  7. Thu2124 Sept
Wood Blewit — botanical illustration

Wood Blewit

Collybia nuda

Starting33 today

Week's best 33average 32by the weekend steady

Conditions stay poor all week — not worth the trip yet.

  1. Today3318 Sept
  2. Sat3319 Sept
  3. Sun3220 Sept
  4. Mon3321 Sept
  5. Tue3222 Sept
  6. Wed3023 Sept
  7. Thu2924 Sept
Field Mushroom — botanical illustration

Field Mushroom

Agaricus campestris

Starting41 today

Week's best 41 — on Fridayaverage 37by the weekend falling

Conditions are poor: even the week's best day only reaches «slow».

  1. Today4118 Sept
  2. Sat4119 Sept
  3. Sun3720 Sept
  4. Mon3621 Sept
  5. Tue3522 Sept
  6. Wed3423 Sept
  7. Thu3324 Sept
Fairy Ring Champignon — botanical illustration

Fairy Ring Champignon

Marasmius oreades

Starting38 today

Week's best 38 — on Fridayaverage 34by the weekend falling

Conditions are poor: even the week's best day only reaches «slow».

  1. Today3818 Sept
  2. Sat3719 Sept
  3. Sun3320 Sept
  4. Mon3321 Sept
  5. Tue3222 Sept
  6. Wed3123 Sept
  7. Thu3124 Sept
Parasol — botanical illustration

Parasol

Macrolepiota procera

Starting46 today

Week's best 46 — on Fridayaverage 41by the weekend falling

Conditions are poor: even the week's best day only reaches «slow».

  1. Today4618 Sept
  2. Sat4519 Sept
  3. Sun4220 Sept
  4. Mon4121 Sept
  5. Tue3822 Sept
  6. Wed3723 Sept
  7. Thu3624 Sept
Common Puffball — botanical illustration

Common Puffball

Lycoperdon perlatum

Starting38 today

Week's best 38 — on Fridayaverage 33by the weekend falling

Conditions are poor: even the week's best day only reaches «slow».

  1. Today3818 Sept
  2. Sat3719 Sept
  3. Sun3420 Sept
  4. Mon3221 Sept
  5. Tue3222 Sept
  6. Wed3123 Sept
  7. Thu3024 Sept
Red Cracking Bolete — botanical illustration

Red Cracking Bolete

Xerocomellus chrysenteron

Starting43 today

Week's best 43 — on Fridayaverage 39by the weekend falling

Conditions are poor: even the week's best day only reaches «slow».

  1. Today4318 Sept
  2. Sat4219 Sept
  3. Sun4120 Sept
  4. Mon4021 Sept
  5. Tue3722 Sept
  6. Wed3623 Sept
  7. Thu3524 Sept
Bovine Bolete — botanical illustration

Bovine Bolete

Suillus bovinus

Starting40 today

Week's best 40 — on Fridayaverage 37by the weekend falling

Conditions are poor: even the week's best day only reaches «slow».

  1. Today4018 Sept
  2. Sat4019 Sept
  3. Sun3920 Sept
  4. Mon3821 Sept
  5. Tue3422 Sept
  6. Wed3323 Sept
  7. Thu3224 Sept
Milk White Brittlegill — botanical illustration

Milk White Brittlegill

Russula delica

Starting43 today

Week's best 43 — on Fridayaverage 40by the weekend falling

Conditions are poor: even the week's best day only reaches «slow».

  1. Today4318 Sept
  2. Sat4219 Sept
  3. Sun4220 Sept
  4. Mon4121 Sept
  5. Tue3722 Sept
  6. Wed3623 Sept
  7. Thu3624 Sept
Black Morel — botanical illustration

Black Morel

Morchella elata

Quiet0 today

Zero all week: this species is not fruiting now.

Fly Agaric — botanical illustration

Fly Agaric

Amanita muscaria

Starting48 today

Week's best 48 — on Fridayaverage 45by the weekend falling

Conditions are poor: even the week's best day only reaches «slow».

  1. Today4818 Sept
  2. Sat4719 Sept
  3. Sun4720 Sept
  4. Mon4721 Sept
  5. Tue4422 Sept
  6. Wed4223 Sept
  7. Thu4124 Sept
Panthercap — botanical illustration

Panthercap

Amanita pantherina

Starting46 today

Week's best 46 — on Fridayaverage 42by the weekend falling

Conditions are poor: even the week's best day only reaches «slow».

  1. Today4618 Sept
  2. Sat4519 Sept
  3. Sun4420 Sept
  4. Mon4321 Sept
  5. Tue3922 Sept
  6. Wed3823 Sept
  7. Thu3724 Sept

Orange Birch Bolete

Leccinum versipelle

Starting46 today

Week's best 46 — on Fridayaverage 42by the weekend falling

Conditions are poor: even the week's best day only reaches «slow».

  1. Today4618 Sept
  2. Sat4519 Sept
  3. Sun4420 Sept
  4. Mon4421 Sept
  5. Tue4022 Sept
  6. Wed3923 Sept
  7. Thu3824 Sept

Stinking Brittlegill

Russula foetens

Starting45 today

Week's best 45 — on Fridayaverage 41by the weekend falling

Conditions are poor: even the week's best day only reaches «slow».

  1. Today4518 Sept
  2. Sat4419 Sept
  3. Sun4320 Sept
  4. Mon4221 Sept
  5. Tue3822 Sept
  6. Wed3723 Sept
  7. Thu3624 Sept

Numbers are taken at the measurement point nearest the centre of the region — a real calculation at one place, not an average over the whole area. A town an hour away will read differently, and its own page says so.

Been out in Hertfordshire? Tell us how it went

No sign-up, five seconds. Reports are visible to everyone and help us check the forecast — where people say “nothing out there” and the model promises a flush, the model is wrong.

How much did you find?
When were you out?

This form does not ask for coordinates. What gets published is the name, the rating and the text — nothing else.

Common questions

Are there mushrooms in Hertfordshire in September 2026?

Conditions in Hertfordshire in September 2026 are middling, index 50 out of 100; of the species we model, penny bun is closest to its flush. There will be something, but you will have to look: check which of the coming days reads higher and go then.

Which mushrooms are out in Hertfordshire right now?

The species list for this region is built from confirmed records in GBIF. As soon as there are enough of them, the species appear here with their own forecast — we do not add a species to a region on a guess.

How is the index calculated?

An index from 0 to 100, built from the last month of weather, satellite woodland data, terrain and the seasonal window of each species. It is not a probability of finding anything: it is how well conditions match what that species needs.

When is the best day to go in Hertfordshire?

Use the seven-day index on this page: pick the day with the higher number, and watch the flush phase — «Building» and «Peak» are the ones worth the drive. Today reads 50 out of 100.

The index is high but I found nothing — why?

The index reads weather and season — things that are the same for tens of kilometres around. It does not know your particular wood, and that is where the mushroom grows. The usual reasons: wrong trees — every species has its own, and no weather makes up for the wrong stand; the wood was felled recently or is young — the mycelium takes years to recover; the spot is picked out — everything near a road or a car park goes over a weekend; the flush has been taken — you came a day after those who came on time; or the flush passed and slugs and larvae got there first, which the model cannot see. The reverse holds too: a low index does not mean an empty wood. It means the conditions are against you, not that there is nothing there.

How the index is calculated, and what the model cannot promise — on the about page.