Main Slab - Lower
Climbing area · United States
Is it worth the trip?
74Good out of 100 for your dates
Best on Wed 4: Rock dry, Rock about 20 °C
Tue 3 · 78 out of 100
- Rock
- Dry
- Rock temp
- 16°C
- Air
- 22°C
- Rain
- 0 mm
Wed 4 · 83 out of 100
- Rock
- Dry
- Rock temp
- 20°C
- Air
- 21°C
- Rain
- 0 mm
Thu 5 · 73 out of 100
- Rock
- Dry
- Rock temp
- 18°C
- Air
- 25°C
- Rain
- 0 mm
Fri 6 · 72 out of 100
- Rock
- Dry
- Rock temp
- 18°C
- Air
- 26°C
- Rain
- 0 mm
Sat 7 · 65 out of 100
- Rock
- Dry
- Rock temp
- 20°C
- Air
- 26°C
- Rain
- 0 mm
Sun 8 · 67 out of 100
- Rock
- Dry
- Rock temp
- 26°C
- Air
- 27°C
- Rain
- 0 mm
Mon 9 · 66 out of 100
- Rock
- Dry
- Rock temp
- 23°C
- Air
- 26°C
- Rain
- 0 mm
Tap a day for rock, its warmth, the air and rain. Full forecast
Forecast: next 10 days
Full forecast- Mon 277, good
- Tue 378, good
- Wed 483, good
- Thu 573, good
- Fri 672, good
- Sat 765, good
- Sun 867, good
- Mon 966, good
- Tue 1074, good
- Wed 110, poor
The spot in two facts
- 18 cragsmapped within 5 km
- Best Apr, Nov6 good days in 7
Full forecast
every day, every number
The score doesn't know loose rock, seepage, access bans or your skill.
| Day | Score | Rock | Rock temp | Air | Rain |
|---|---|---|---|---|---|
| Mon 2Nov* | 77, good | Dry? | 21°C | 22°C | 0 mm |
| Tue 3Nov | 78, good | Dry | 16°C | 22°C | 0 mm |
| Wed 4Nov | 83, good | Dry | 20°C | 21°C | 0 mm |
| Thu 5Nov | 73, good | Dry | 18°C | 25°C | 0 mm |
| Fri 6Nov | 72, good | Dry | 18°C | 26°C | 0 mm |
| Sat 7Nov | 65, good | Dry | 20°C | 26°C | 0 mm |
| Sun 8Nov | 67, good | Dry | 26°C | 27°C | 0 mm |
| Mon 9Nov | 66, good | Dry | 23°C | 26°C | 0 mm |
| Tue 10Nov | 74, good | Dry | 24°C | 25°C | 0 mm |
| Wed 11Nov | 0, poor | Wet | 16°C | 16°C | 9.3 mm |
* Rain before today is not known: the forecast starts today, so these days are scored from a dry start and a wet one.
Rock and air are in °C, the rock's with the sun on it; rain in mm. More
Forecast updated . It refreshes every three hours. Forecast data: ECMWF, DWD, Météo-France and NOAA, served by Open-Meteo.com (CC BY 4.0). Changed by us. Generated using E.U. Copernicus Marine Service Information.
Best time to go
best Apr, Nov
Good climbing days in a typical week, each month, from 2016 on (ERA5 history scored the same way).
- Jan5of 7: a trip from Sat 2 Jan
- Feb5of 7: a trip from Sat 6 Feb
- Mar5of 7: a trip from Sat 6 Mar
- Apr6of 7: a trip from Sat 3 Apr
- May5of 7: a trip from Sat 1 May
- Jun4of 7: a trip from Sat 5 Jun
- Jul1of 7: a trip from Sat 3 Jul
- Aug1of 7: a trip from Sat 7 Aug
- Sep2of 7: a trip from Sat 4 Sept
- Oct5of 7: a trip from Sat 2 Oct
- Nov6of 7: a trip from Tue 3 Nov
- Dec5of 7: a trip from Sat 5 Dec
Tap a month to see this spot for a trip then.
Typical weather, not a forecast.
Map
the area and its town
Main Slab - Lower on Google Maps · Directions
Each place wears its best day on these dates: green good, amber fair, pale red poor, as the key says.
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One finger scrolls the page; two fingers move the map. Pins are our own positions. Map OpenFreeMap, © OpenMapTiles, data © OpenStreetMap contributors.
About
the place in full, sources, credits
About Main Slab - Lower
18 crags mapped. Best from Oct to Jun. The nearest town to stay in is Perris.
- Crags 18 crags mapped.
- Rock No source states the rock.
From OpenStreetMap: the crags mapped within 5 km. Check access and bans locally.
Crags: © OpenStreetMap contributors (ODbL).
The score is the conditions only: the journey, the price and the partners never change it (how we score, how we earn).
Rough cost (estimate): about US$1,230–US$2,240 each
about US$1,230–US$2,240 each · 6 nights, 2 sharing: flights, hire car, stay, food, climbing instructor.
Our estimate from typical public prices, not a quote: check the real prices before you book (where they come from). Prices are about, in US Dollar (USD): our pound figures at the European Central Bank's rate of 30 October 2026.
How we worked it out
| What | How we worked it out | Each |
|---|---|---|
| Flights | return MDW to ONT, estimated from distance and season, 1 airline on the route, with a hold bag | about US$248–US$509 |
| Hire car | 6 days, shared | about US$154–US$255 |
| Stay | 6 nights, a mid-range double, shared | about US$348–US$583 |
| Food | 7 days eating out | about US$342–US$636 |
| Climbing instructor | 1 day with an instructor, shared; leave it out if you climb on your own | about US$141–US$261 |
| Total | about US$1,230–US$2,240 |
Climbers bring their own kit: it is not in the cost. Prices from public sources, checked in 2026.
Where to stay: Perris
about 15 min by car · 3 places to stay
about US$134/nightcountry average
About Perris its beds, food and every spot near it
About US$134 a night is our estimate of the country's average 2-star double room that month: not each town's price, and not a quote. Drives are estimates. Prices are about, in US Dollar (USD): our pound figures at the European Central Bank's rate of 30 October 2026.
Getting there: about 7h 10m
About 7h 10m door to door from Chicago
Fly MDW → ONT, direct, then 1h 10m by road
Flights MDW → ONT on your dates · Skyscanner
An estimate, one way; the journey never changes the score.