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Nectarine variety

Harko

The short answer

Harko requires 800 chill hours[1] and grows in USDA zones 3–9[2]. It is self-fertile[1].

Growing facts

Harko growing facts
Chill requirement800 chill hours[1] (nursery figure)
HardinessUSDA zones 3–9[2] (nursery figure)
PollinationSelf-fertile[1]
Harvest windowJuly[1]
Years to bearingNot published
Harko nectarineSpecies illustration — no historical watercolor exists for this cultivar

Notes

  • High-chill (about 800 hr), hardy yellow freestone nectarine ripening early July; an Ontario (Harrow) release suited to cooler climates.[1]
  • Self-fruitful.[1]

A year with your Harko

When the work happens for a nectarine in USDA zone 6, anchored to typical frost dates.

Months for pruning, thinning, spray-timing windows, and harvest for Nectarine in zone 6
TaskJFMAMJJASOND
Prune——————————
Thin———————————
Spray timing——————
Harvest————————
Care———————————

See the full month-by-month nectarine calendar for zone 6 →

Can I grow Harko where I live?

Check the verdict for a few regions, or your exact ZIP:

Growing a Harko? Get its care calendar for your exact ZIP code, starting with this month’s tasks for one tree, free.

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Questions

How many chill hours does Harko need?
Harko needs 800 chill hours.
What hardiness zones suit Harko?
Harko grows in USDA zones 3–9.
Is Harko self-pollinating?
Harko is self-fertile, though a pollination partner can improve cropping.

Sources

  1. [1] Dave Wilson Nursery. Nectarines — DWN Variety Finder product list — accessed July 2026
  2. [2] Dave Wilson Nursery. Harko — variety specifications — accessed October 2026