April signals the end of reliable aurora conditions for most of the northern hemisphere. Nights have shortened enough at mid and lower latitudes that even moderate geomagnetic activity produces little practical viewing opportunity. Only the highest-latitude northern locations - those at around 65°N or above, needing Kp 2 or below - retain meaningful darkness windows. Tromsø, Svalbard, Iceland, Greenland, northern Scandinavia, and the far north of Canada and Alaska are still viable, though conditions rate as marginal rather than good as twilight begins to intrude.
For the Scandinavian and Scottish mid-latitude sites that were active through winter, April is effectively the end of the season. Nights above 60°N are now short enough that even a strong geomagnetic storm produces only a brief display window around midnight. If you are planning a trip to northern Europe for aurora, March is the last reliably productive month.
The southern hemisphere more than compensates. April is the start of a reliable aurora australis season at high and mid southern latitudes. Autumn darkness has returned to Ushuaia, Stewart Island, Queenstown, and Hobart. High-latitude austral sites rate as good; mid-latitude sites including much of Tasmania and New Zealand's South Island are also in good condition. April through August represents the core of the southern aurora season, and April is the month it properly begins.
Planning your trip in April
Spring arrives in northern Scandinavia and Iceland in April. Snow begins to melt at lower elevations and days lengthen rapidly. The high Arctic (Svalbard, north Greenland) remains frozen. In the southern hemisphere, Patagonia, Tasmania, and New Zealand's South Island begin their autumn cool with more settled air than winter. April is a pleasant travel month in both hemispheres.
Limited at northern high latitudes. Tromsø gets around 7 to 8 hours of darkness by April, shortening rapidly. Iceland gets about 8 hours of darkness in early April, barely enough by month end. In the south, Ushuaia has around 12 hours of darkness, with nights lengthening toward winter. Hobart and Queenstown have 11 to 12 hours.
April is off-peak for Arctic aurora destinations - prices drop significantly from March and accommodation is easy to find. The southern hemisphere aurora season is only beginning, so prices in Ushuaia and Queenstown are not yet at their winter peak. April is one of the more cost-effective months to plan an aurora trip.
