Crace Grasslands

Crace Grasslands Nature Reserve is a 1.59 square kilometre protected area in the Gungahlin district of northern Canberra, protecting a low-lying grassland that rises to Crace Hill at 622 metres. Established in 1995 and surrounded by the rapidly developing suburbs of Gungahlin, the reserve safeguards critically endangered Natural Temperate Grassland and provides habitat for two nationally threatened species — the Striped Legless Lizard (Delma impar) and the Golden Sun Moth (Synemon plana). The reserve is one of the most significant urban grassland conservation areas in the ACT and demonstrates that high conservation values can persist within intensively developed areas when appropriate management is applied. The reserve is managed by the ACT Parks and Conservation Service.

Crace Grasslands is nationally significant for two threatened species. The Striped Legless Lizard (Delma impar) — a small, snake-like skink listed as vulnerable under the Environment Protection and Biodiversity Conservation Act — inhabits the dense native tussock grass communities of the reserve. The Golden Sun Moth (Synemon plana) — a large, colourful moth with a striking orange-red forewing — is also listed as vulnerable; its larvae spend up to twelve years underground feeding on grass roots before emerging as adults in spring for a brief mating flight. Eastern grey kangaroos and common wombats use the reserve. The grassland supports a diverse invertebrate community including beetles, bugs, spiders, and native bees. Various raptor species — kestrels, hobbies, and harriers — hunt the open grassland for prey.

The dominant vegetation is critically endangered Natural Temperate Grassland, characterised by a diverse matrix of native tussock grasses and associated forbs. Kangaroo grass (Themeda triandra), wallaby grass (Austrodanthonia species), and weeping grass (Microlaena stipoides) are the primary grass species, interspersed with an array of native forbs including native daisies, lilies, bluebells, trigger plants, and various herbs. The reserve's floristic diversity is greatest in spring, when dozens of native forb species flower simultaneously. Shrubby patches of old man saltbush and native herbs occur at the reserve margins. Invasive pasture grasses including serrated tussock, African lovegrass, and paspalum are ongoing management challenges. The reserve's grassland community is carefully managed to maintain the dense tussock structure required by the Striped Legless Lizard.

Crace Grasslands occupies a gently undulating to flat landscape underlain by Silurian-age metasedimentary rocks — siltstones, mudstones, and fine sandstones — that have weathered to produce moderately deep, silty to clayey soils. These heavier soils retain moisture better than the sandy soils of granitic ridge reserves, supporting the productive grassland community. Crace Hill at 622 metres represents a subtle topographic high point on the otherwise flat Gungahlin tableland. The reserve's soil profile reflects centuries of grassland vegetation, with organic matter accumulated in the upper layers. The broader geological context of the Gungahlin area is a low tableland surface eroded from Silurian metasedimentary rocks, contrasting with the granitic ridge landforms of central and southern Canberra.

Crace Grasslands experiences the continental temperate climate of northern Canberra, with hot summers and cold winters. The open, flat grassland environment experiences greater temperature extremes than surrounding urban areas due to the absence of shade and the heat-absorbing capacity of deep, dark soils. Summer temperatures regularly exceed 30–35°C in the reserve. Winters bring regular overnight frosts from May through August, and the grassland surface experiences deep frost on calm, clear nights — a condition to which native temperate grasses are well adapted. Mean annual rainfall is approximately 620–640mm with a slight summer peak from convective thunderstorms. The Golden Sun Moth's emergence flight timing in spring is closely tied to temperature and moisture conditions.

Crace Grasslands lies within Ngunnawal country and the open grassland landscape was an important resource for Ngunnawal people. Native temperate grasslands supported populations of wallabies, kangaroos, bettongs, and other grazing animals, as well as providing plant foods including the underground tubers of yam daisy (Microseris species) and the seeds of native grasses. European pastoral settlement from the 1820s brought sheep and cattle grazing that progressively degraded the native grassland through selective grazing pressure, soil compaction, and the introduction of invasive pasture grasses. The Gungahlin area was developed for residential use from the late 1980s and 1990s; the reserve was gazetted in 1995 to protect the remaining significant grassland remnant within the new suburb development.

Crace Grasslands was gazetted as a nature reserve in 1995, coinciding with the rapid residential development of the Gungahlin district. The reserve's establishment was driven by surveys confirming the presence of nationally threatened species — the Striped Legless Lizard and Golden Sun Moth — within the grassland. Since gazettal, management has focused on weed control, grazing management, and maintaining the native tussock grass structure that these threatened species require. Mowing and slashing regimes are carefully timed to avoid sensitive periods in the life cycles of both threatened species. The reserve has been the subject of significant research, particularly on the ecology and conservation of Striped Legless Lizards and Golden Sun Moths within urban grassland remnants.

Crace Grasslands offers informal walking along its track network and grassland margins, with the primary attraction being the observation of the reserve's threatened species and seasonal wildflower displays. Spring is the best time to visit, when native forbs flower in profusion and — on warm, sunny mornings from October to December — Golden Sun Moths may be observed in their spectacular emergence flight. Striped Legless Lizards are best detected by experienced observers searching carefully through dense grass tussocks. The reserve's modest Crace Hill summit provides broad views across the Gungahlin district and surrounding development. Birdwatching on the open grassland is rewarding for species including pipits, quail, and various raptors.

Crace Grasslands is located in the Gungahlin district of northern Canberra, adjacent to the suburb of Crace. Access is from Mirrabei Drive and surrounding streets. The reserve is approximately 15 kilometres north of central Canberra. No formal visitor centre or toilet facilities are located within the reserve; facilities are available in the nearby Gungahlin town centre. No entry fee applies. Dogs are permitted on leash on designated tracks. Car parking is available in adjacent residential streets. The reserve is served by bus routes in the surrounding Gungahlin suburbs. Visitors are asked to stay on designated tracks to avoid disturbing the threatened species habitat. Binoculars are useful for raptor and grassland bird observation.

Crace Grasslands is one of the ACT's most intensively managed urban nature reserves due to the presence of two nationally threatened species. Weed control is the most significant management challenge, with invasive pasture grasses continuously threatening to displace native tussock grass communities essential to both the Striped Legless Lizard and Golden Sun Moth. Mowing and slashing are timed to maintain appropriate grassland structure — avoiding cutting during the winter months when lizards shelter in dense grass and during the spring emergence period for Golden Sun Moths. Monitoring programs track populations of both threatened species to assess management effectiveness. The ACT Parks and Conservation Service works with the Commonwealth government under the EPBC Act to ensure conservation of the nationally significant species populations.