Grassland

Grassland

An open expanse dominated by tall grasses. These areas are good for farming and ranching, except when there's a drought. The lack of trees and other vegetation means there's always a steady breeze. Steam geysers never appear here due to low geothermal activity.

Base Stats

Type

Biome

Texture on World Map

Allows colonies

Yes

Allows Roads and Rivers

Yes

Animal Density

3.7

Plant Density

1.0

Disease MTB Days

50 days

Movement Difficulty

1^[Note]

Forageability

100%

Wild Plant Regrow Days

13 days

Min Temperature

-10 °C (14 °F)

Max Temperature

55 °C (131 °F)

Rainfall range

800mm – 2500mm

Swampiness range

N/A

Max Fish Population

540

Weather Commonalities

Clear

12

Fog

1

Rain

2

Foggy rain

2

Dry Thunderstorm

1

Rainy Thunderstorm

1

Soft snow

1

Hard snow

1

Gray Pall

1

Windy

4

Grasslands is a warm biome in RimWorld added by the Odyssey DLC.

Summary

Grasslands never have any steam geysers. Grasslands may have droughts occur with a minimum of 40 days between them. It will never spawn in mountains.

In the lists below the number in brackets represents the relative commonality.

Flora

• Berry bush (0.05)
• Bush (0.2)
• Dandelions (0.3)
• Oak tree (0.02)
• Poplar tree (0.05)
• Wild healroot (0.05)
• Gray grass  (9)
• Lily pad  (0.2)
• Reeds  (1)
• Tall yellow grass  (9)
• Yellow grass  (9)

Fauna

• Bison (0.5)
• Boomalope (0.4)
• Cougar (0.07)
• Deer (0.5)
• Donkey (0.2)
• Grizzly bear (0.07)
• Hare (1)
• Horse (0.2)
• Ibex (0.5)
• Lynx (0.07)
• Muffalo (1)
• Raccoon (0.5)
• Red fox (0.07)
• Squirrel (1)
• Timber wolf (0.07)
• Turkey (0.5)
• Warg (0.07)
• Wild boar (0.5)
• Yak (0.06)
• Crow  (0.5)
• Mastodon  (0.2)
• Porcupine  (0.2)
• Prairie dog  (1)
• Sparrow  (0.5)
• Vulture  (0.5)

Additionally, these animals can spawn in coastal maps:

• Seal  (0.1)

If the map is polluted, then the game may choose to spawn in wild animals from this list instead:

• Boomalope (0.1)
• Raccoon (0.5)
• Warg (0.05)
• Toxalope  (0.4)

Diseases

Grassland has a disease MTB of 50 days. The following diseases can occur in a grassland:

Disease	Commonality
Flu	100
Plague	100
Malaria	100
Gut worms	50
Fibrous mechanites	30
Sensory mechanites	30
Muscle parasites	50
Animal flu	100
Animal plague	100
Organ decay	10

Fish

The table below contains the list of all of the fish that can be caught - as well as where they can be caught.

Fish	Water body	Rarity
Bass	Freshwater	Common
Catfish	Freshwater	Uncommon
Bluefish	Saltwater	Common
Marlin	Saltwater	Uncommon
Flounder	Saltwater	Uncommon

Droughts

See also: Drought

Grasslands may have droughts. This is seperated into two events:

• The Drought (initial) event always occurs first, lasts 4 days, and is hidden from the player. During drought (initial), rain cannot occur for 4 days - this includes the firewatcher that naturally encourages rain when fire is present.
• The proper Drought event disables rain and causes all crops outside hydroponics to grow at 30% speed, and lasts from 6 to 10 days.

Droughts have a 40 day cooldown before they can fire again.

Summary

Grasslands is seemingly easy, being identical to temperate forest in many ways, but droughts can present a challenge to inexperienced players or to fresh colonies in general. The lack of geothermal power can also present a difficulty, as geothermal is normally a great way to get consistent power.

• Growing and Food: Moderate - When not in a drought, growing is comfortable with year-round growing seasons. Animals are fairly common, too. Droughts slow food growth, though, so more crops need to be grown than normal. Also, crop destruction and blight are more harmful due to the slower growth speed. Hydroponics are immune to drought.

• Disease: Easy - Grassland is identical to temperate forest. For a year-round growing biome, it has a relatively low disease frequency, and wild healroot grows naturally.

• Temperature: Easy-Moderate - Temperatures are warm and normally comfortable. Heat waves can present an issue, and trees are less common than in other temperate biomes.

• Fires: Difficult - Grassland is filled with flammable grass, and droughts disable the game's natural firewatcher for 10-14 days. Installing 2-tile wide firebreaks of non-flammable material around important areas, and using non-flammable materials construction, is recommended.

Gallery

• 

  A fully generated grassland

• 

  Grassland's texture on the world map

History

• Odyssey DLC Release - Added.

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Biomes

Temperate

Temperate forest • Temperate swamp • Scarlands

Hot

Tropical rainforest • Tropical swamp • Arid shrubland • Desert • Extreme desert • Glowforest • Grassland • Lava field

Cold

Boreal forest • Cold bog • Tundra • Ice sheet • Sea ice • Glacial plain • Orbit

Water

Lake • Ocean

Pocket map

Underground • Labyrinth • Metal hell • Undercave • Insect lair